// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/animation/animation_host.h"

#include <limits>

#include "base/memory/ptr_util.h"
#include "base/test/scoped_feature_list.h"
#include "base/time/time.h"
#include "cc/animation/animation_id_provider.h"
#include "cc/animation/animation_timeline.h"
#include "cc/animation/scroll_timeline.h"
#include "cc/animation/worklet_animation.h"
#include "cc/base/features.h"
#include "cc/test/animation_test_common.h"
#include "cc/test/animation_timelines_test_common.h"
#include "cc/test/mock_layer_tree_mutator.h"
#include "cc/trees/scroll_node.h"
#include "cc/trees/transform_node.h"
#include "testing/gmock/include/gmock/gmock.h"
#include "testing/gtest/include/gtest/gtest.h"

using ::testing::_;
using ::testing::InvokeWithoutArgs;
using ::testing::Mock;
using ::testing::NiceMock;
using ::testing::Return;

namespace cc {
namespace {

// Helper method to convert base::TimeTicks to double.
// Returns double milliseconds if the input value is resolved or
// std::numeric_limits<double>::quiet_NaN() otherwise.
double ToMilliseconds(std::optional<base::TimeTicks> time_ticks) {
  if (!time_ticks) {
    return std::numeric_limits<double>::quiet_NaN();
  }
  return (time_ticks.value() - base::TimeTicks()).InMillisecondsF();
}

class AnimationHostTest : public AnimationTimelinesTest {
 public:
  AnimationHostTest() = default;
  ~AnimationHostTest() override = default;

  void AttachWorkletAnimation() {
    client_.RegisterElementId(element_id_, ElementListType::ACTIVE);
    client_impl_.RegisterElementId(element_id_, ElementListType::PENDING);
    client_impl_.RegisterElementId(element_id_, ElementListType::ACTIVE);

    worklet_animation_ = WorkletAnimation::Create(
        worklet_animation_id_, "test_name", 1, nullptr, nullptr);
    int cc_id = worklet_animation_->id();
    worklet_animation_->AttachElement(element_id_);
    host_->AddAnimationTimeline(timeline_);
    timeline_->AttachAnimation(worklet_animation_);

    host_->PushPropertiesTo(host_impl_, client_.GetPropertyTrees());
    timeline_impl_ = host_impl_->GetTimelineById(timeline_id_);
    worklet_animation_impl_ =
        ToWorkletAnimation(timeline_impl_->GetAnimationById(cc_id));
  }

  void SetOutputState(base::TimeDelta local_time) {
    MutatorOutputState::AnimationState state(worklet_animation_id_);
    state.local_times.push_back(local_time);
    worklet_animation_impl_->SetOutputState(state);
  }

  scoped_refptr<WorkletAnimation> worklet_animation_;
  scoped_refptr<WorkletAnimation> worklet_animation_impl_;
  WorkletAnimationId worklet_animation_id_{11, 12};
};

// See Animation tests on layer registration/unregistration in
// animation_unittest.cc.

TEST_F(AnimationHostTest, SyncTimelinesAddRemove) {
  TestHostClient host_client(ThreadInstance::kMain);
  AnimationHost* host = host_client.host();
  TestHostClient host_impl_client(ThreadInstance::kImpl);
  AnimationHost* host_impl = host_impl_client.host();

  const int timeline_id = AnimationIdProvider::NextTimelineId();
  scoped_refptr<AnimationTimeline> timeline(
      AnimationTimeline::Create(timeline_id));
  host->AddAnimationTimeline(timeline.get());
  EXPECT_TRUE(timeline->animation_host());

  EXPECT_FALSE(host_impl->GetTimelineById(timeline_id));

  host->PushPropertiesTo(host_impl, client_.GetPropertyTrees());

  scoped_refptr<AnimationTimeline> timeline_impl =
      host_impl->GetTimelineById(timeline_id);
  EXPECT_TRUE(timeline_impl);
  EXPECT_EQ(timeline_impl->id(), timeline_id);

  host->PushPropertiesTo(host_impl, client_.GetPropertyTrees());
  EXPECT_EQ(timeline_impl, host_impl->GetTimelineById(timeline_id));

  host->RemoveAnimationTimeline(timeline.get());
  EXPECT_FALSE(timeline->animation_host());

  host->PushPropertiesTo(host_impl, client_.GetPropertyTrees());
  EXPECT_FALSE(host_impl->GetTimelineById(timeline_id));

  EXPECT_FALSE(timeline_impl->animation_host());
}

TEST_F(AnimationHostTest, ImplOnlyTimeline) {
  TestHostClient host_client(ThreadInstance::kMain);
  AnimationHost* host = host_client.host();
  TestHostClient host_impl_client(ThreadInstance::kImpl);
  AnimationHost* host_impl = host_impl_client.host();

  const int timeline_id1 = AnimationIdProvider::NextTimelineId();
  const int timeline_id2 = AnimationIdProvider::NextTimelineId();

  scoped_refptr<AnimationTimeline> timeline(
      AnimationTimeline::Create(timeline_id1));
  scoped_refptr<AnimationTimeline> timeline_impl(
      AnimationTimeline::Create(timeline_id2, /* is_impl_only */ true));

  host->AddAnimationTimeline(timeline.get());
  host_impl->AddAnimationTimeline(timeline_impl.get());

  host->PushPropertiesTo(host_impl, client_.GetPropertyTrees());

  EXPECT_TRUE(host->GetTimelineById(timeline_id1));
  EXPECT_TRUE(host_impl->GetTimelineById(timeline_id2));
}

TEST_F(AnimationHostTest, ImplOnlyScrollAnimationUpdateTargetIfDetached) {
  client_.RegisterElementId(element_id_, ElementListType::ACTIVE);
  client_impl_.RegisterElementId(element_id_, ElementListType::PENDING);

  gfx::PointF target_offset(0., 2.);
  gfx::PointF current_offset(0., 1.);
  host_impl_->ImplOnlyScrollAnimationCreate(element_id_, target_offset,
                                            current_offset, base::TimeDelta(),
                                            base::TimeDelta());

  gfx::Vector2dF scroll_delta(0, 0.5);
  gfx::PointF max_scroll_offset(0., 3.);

  base::TimeTicks time;

  time += base::Seconds(0.1);
  EXPECT_TRUE(host_impl_->ImplOnlyScrollAnimationUpdateTarget(
      scroll_delta, max_scroll_offset, time, base::TimeDelta(), element_id_));

  // Detach all animations from layers and timelines.
  host_impl_->ClearMutators();

  time += base::Seconds(0.1);
  EXPECT_FALSE(host_impl_->ImplOnlyScrollAnimationUpdateTarget(
      scroll_delta, max_scroll_offset, time, base::TimeDelta(), element_id_));
}

// Tests that verify interaction of AnimationHost with LayerTreeMutator.

TEST_F(AnimationHostTest, FastLayerTreeMutatorUpdateTakesEffectInSameFrame) {
  AttachWorkletAnimation();

  const float start_opacity = .7f;
  const float end_opacity = .3f;
  const double duration = 1.;

  const float expected_opacity =
      start_opacity + (end_opacity - start_opacity) / 2;
  AddOpacityTransitionToAnimation(worklet_animation_.get(), duration,
                                  start_opacity, end_opacity, true);

  base::TimeDelta local_time = base::Seconds(duration / 2);

  MockLayerTreeMutator* mock_mutator = new NiceMock<MockLayerTreeMutator>();
  host_impl_->SetLayerTreeMutator(
      base::WrapUnique<LayerTreeMutator>(mock_mutator));
  ON_CALL(*mock_mutator, HasMutators()).WillByDefault(Return(true));
  ON_CALL(*mock_mutator, MutateRef(_))
      .WillByDefault(InvokeWithoutArgs(
          [this, local_time]() { this->SetOutputState(local_time); }));

  // Push the opacity animation to the impl thread.
  host_->PushPropertiesTo(host_impl_, client_.GetPropertyTrees());
  host_impl_->ActivateAnimations(nullptr);

  // Ticking host should cause layer tree mutator to update output state which
  // should take effect in the same animation frame.
  TickAnimationsTransferEvents(base::TimeTicks(), 0u);

  // Emulate behavior in PrepareToDraw. Animation worklet updates are best
  // effort, and the animation tick is deferred until draw to allow time for the
  // updates to arrive.
  host_impl_->TickWorkletAnimations();

  TestLayer* layer =
      client_.FindTestLayer(element_id_, ElementListType::ACTIVE);
  EXPECT_FALSE(layer->is_property_mutated(TargetProperty::OPACITY));
  client_impl_.ExpectOpacityPropertyMutated(
      element_id_, ElementListType::ACTIVE, expected_opacity);
}

TEST_F(AnimationHostTest, LayerTreeMutatorsIsMutatedWithCorrectInputState) {
  AttachWorkletAnimation();

  MockLayerTreeMutator* mock_mutator = new NiceMock<MockLayerTreeMutator>();
  host_impl_->SetLayerTreeMutator(
      base::WrapUnique<LayerTreeMutator>(mock_mutator));
  ON_CALL(*mock_mutator, HasMutators()).WillByDefault(Return(true));

  const float start_opacity = .7f;
  const float end_opacity = .3f;
  const double duration = 1.;

  AddOpacityTransitionToAnimation(worklet_animation_.get(), duration,
                                  start_opacity, end_opacity, true);

  host_->PushPropertiesTo(host_impl_, client_.GetPropertyTrees());
  host_impl_->ActivateAnimations(nullptr);

  EXPECT_CALL(*mock_mutator, MutateRef(_));

  base::TimeTicks time;
  time += base::Seconds(0.1);
  TickAnimationsTransferEvents(time, 0u);
}

TEST_F(AnimationHostTest, LayerTreeMutatorsIsMutatedOnlyWhenInputChanges) {
  AttachWorkletAnimation();

  MockLayerTreeMutator* mock_mutator = new NiceMock<MockLayerTreeMutator>();
  host_impl_->SetLayerTreeMutator(
      base::WrapUnique<LayerTreeMutator>(mock_mutator));
  ON_CALL(*mock_mutator, HasMutators()).WillByDefault(Return(true));

  const float start_opacity = .7f;
  const float end_opacity = .3f;
  const double duration = 1.;

  AddOpacityTransitionToAnimation(worklet_animation_.get(), duration,
                                  start_opacity, end_opacity, true);

  host_->PushPropertiesTo(host_impl_, client_.GetPropertyTrees());
  host_impl_->ActivateAnimations(nullptr);

  EXPECT_CALL(*mock_mutator, MutateRef(_)).Times(1);

  base::TimeTicks time;
  time += base::Seconds(0.1);
  TickAnimationsTransferEvents(time, 0u);

  // The time has not changed which means worklet animation input is the same.
  // Ticking animations again should not result in mutator being asked to
  // mutate.
  TickAnimationsTransferEvents(time, 0u);
}

class MockAnimation : public Animation {
 public:
  explicit MockAnimation(int id) : Animation(id) {}
  MOCK_METHOD1(Tick, bool(base::TimeTicks monotonic_time));

 private:
  ~MockAnimation() override {}
};

bool Animation1TimeEquals20(MutatorInputState* input) {
  std::unique_ptr<AnimationWorkletInput> in = input->TakeWorkletState(333);
  return in && in->added_and_updated_animations.size() == 1 &&
         in->added_and_updated_animations[0]
                 .worklet_animation_id.animation_id == 22;
  // TODO(kevers): Consider validating current time once specced how to
  // consolidate percentages and time-based values with animation worklets.
  // The duration of a scroll-driven animation is not constant when expressed
  // in units of time.
}

void CreateScrollingNodeForElement(ElementId element_id,
                                   PropertyTrees* property_trees,
                                   bool is_composited = true) {
  // A scrolling node in cc has a corresponding transform node (See
  // |ScrollNode::transform_id|). This setup here creates both nodes and links
  // them as they would normally be. This more complete setup is necessary here
  // because ScrollTimeline depends on both nodes for its calculations.
  TransformNode transform_node;
  transform_node.scrolls = true;
  int transform_node_id =
      property_trees->transform_tree_mutable().Insert(transform_node, 0);
  property_trees->transform_tree_mutable().SetElementIdForNodeId(
      transform_node_id, element_id);

  ScrollNode scroll_node;
  // Setup scroll dimention to be 100x100.
  scroll_node.bounds = gfx::Size(200, 200);
  scroll_node.container_bounds = gfx::Size(100, 100);
  scroll_node.element_id = element_id;
  scroll_node.transform_id = transform_node_id;
  scroll_node.is_composited = is_composited;

  int scroll_node_id =
      property_trees->scroll_tree_mutable().Insert(scroll_node, 0);
  if (!property_trees->is_main_thread()) {
    property_trees->scroll_tree_mutable()
        .GetOrCreateSyncedScrollOffsetForTesting(element_id);
  }
  property_trees->scroll_tree_mutable().SetElementIdForNodeId(scroll_node_id,
                                                              element_id);
}

void SetScrollOffset(PropertyTrees* property_trees,
                     ElementId element_id,
                     gfx::PointF offset) {
  // Update both scroll and transform trees
  property_trees->scroll_tree_mutable().SetScrollOffset(element_id, offset);
  TransformNode* transform_node =
      property_trees->transform_tree_mutable().FindNodeFromElementId(
          element_id);
  transform_node->SetScrollOffset(offset, DamageReason::kUntracked);
  transform_node->needs_local_transform_update = true;
}

// TODO(kevers): Scroll-timelines are specced to work in percentages but work
// internally in units of time for convenience. Since the timeline duration is
// not exposed as a time, the time scaling factor is not externally visible.
// For now, the test is simply disabled. If work on AnimationWorklets resumes
// and scroll timelines become an integral part, then we can revisit the test.
TEST_F(AnimationHostTest,
       DISABLED_LayerTreeMutatorUpdateReflectsScrollAnimations) {
  ElementId element_id = element_id_;
  int animation_id1 = 11;
  int animation_id2 = 12;
  WorkletAnimationId worklet_animation_id{333, 22};

  client_.RegisterElementId(element_id, ElementListType::ACTIVE);
  client_impl_.RegisterElementId(element_id, ElementListType::PENDING);
  client_impl_.RegisterElementId(element_id, ElementListType::ACTIVE);
  host_impl_->AddAnimationTimeline(timeline_);

  PropertyTrees property_trees(*host_impl_);
  property_trees.set_is_main_thread(false);
  property_trees.set_is_active(true);
  CreateScrollingNodeForElement(element_id, &property_trees);

  // Set an initial scroll value.
  SetScrollOffset(&property_trees, element_id, gfx::PointF(10, 10));

  scoped_refptr<MockAnimation> mock_scroll_animation(
      new MockAnimation(animation_id1));
  EXPECT_CALL(*mock_scroll_animation, Tick(_))
      .WillOnce(InvokeWithoutArgs([&]() -> bool {
        // Scroll to 20% of the max value.
        SetScrollOffset(&property_trees, element_id, gfx::PointF(20, 20));
        return true;
      }));

  // Ensure scroll animation is ticking.
  timeline_->AttachAnimation(mock_scroll_animation);
  host_impl_->AddToTicking(mock_scroll_animation);

  // Create scroll timeline that links scroll animation and worklet animation
  // together.
  ScrollTimeline::ScrollOffsets scroll_offsets(0, 100);
  auto scroll_timeline = ScrollTimeline::Create(
      element_id, ScrollTimeline::ScrollDown, scroll_offsets);

  // Create a worklet animation that is bound to the scroll timeline.
  scoped_refptr<WorkletAnimation> worklet_animation(
      new WorkletAnimation(animation_id2, worklet_animation_id, "test_name", 1,
                           nullptr, nullptr, true));
  host_impl_->AddAnimationTimeline(scroll_timeline);
  scroll_timeline->AttachAnimation(worklet_animation);

  worklet_animation->AttachElement(element_id);

  AddOpacityTransitionToAnimation(worklet_animation.get(), 1, .7f, .3f, true);

  MockLayerTreeMutator* mock_mutator = new NiceMock<MockLayerTreeMutator>();
  host_impl_->SetLayerTreeMutator(
      base::WrapUnique<LayerTreeMutator>(mock_mutator));
  ON_CALL(*mock_mutator, HasMutators()).WillByDefault(Return(true));
  EXPECT_CALL(*mock_mutator,
              MutateRef(::testing::Truly(Animation1TimeEquals20)))
      .Times(1);

  // Ticking host should cause scroll animation to scroll which should also be
  // reflected in the input of the layer tree mutator in the same animation
  // frame.
  host_impl_->TickAnimations(base::TimeTicks(), property_trees.scroll_tree(),
                             false);
}

TEST_F(AnimationHostTest, TickScrollLinkedAnimation) {
  client_.RegisterElementId(element_id_, ElementListType::ACTIVE);
  client_impl_.RegisterElementId(element_id_, ElementListType::PENDING);
  client_impl_.RegisterElementId(element_id_, ElementListType::ACTIVE);
  PropertyTrees property_trees(*host_impl_);
  property_trees.set_is_main_thread(false);
  property_trees.set_is_active(true);
  CreateScrollingNodeForElement(element_id_, &property_trees);

  // Create scroll timeline that links scroll animation and scroll-linked
  // animation together.
  ScrollTimeline::ScrollOffsets scroll_offsets(0, 100);
  auto scroll_timeline = ScrollTimeline::Create(
      element_id_, ScrollTimeline::ScrollDown, scroll_offsets);

  int animation_id = 11;
  // Create an animation that is bound to the scroll timeline.
  scoped_refptr<Animation> animation = Animation::Create(animation_id);
  host_impl_->AddAnimationTimeline(scroll_timeline);
  scroll_timeline->AttachAnimation(animation);

  ASSERT_TRUE(animation->IsScrollLinkedAnimation());

  animation->AttachElement(element_id_);

  AddOpacityTransitionToAnimation(animation.get(), 1, .7f, .3f, true);
  auto* keyframe_model = animation->GetKeyframeModel(TargetProperty::OPACITY);
  EXPECT_EQ(keyframe_model->run_state(),
            KeyframeModel::WAITING_FOR_TARGET_AVAILABILITY);

  const auto& scroll_tree = property_trees.scroll_tree();
  SetScrollOffset(&property_trees, element_id_, gfx::PointF(0, 20));
  EXPECT_TRUE(
      host_impl_->TickAnimations(base::TimeTicks(), scroll_tree, false));

  EXPECT_EQ(keyframe_model->run_state(), KeyframeModel::STARTING);
  double tick_time =
      ToMilliseconds(scroll_timeline->CurrentTime(scroll_tree, false));
  double duration =
      ToMilliseconds(scroll_timeline->Duration(scroll_tree, false));
  EXPECT_NEAR(tick_time, 0.2 * duration, 1e-6);
  scroll_timeline->DetachAnimation(animation);
  EXPECT_FALSE(
      host_impl_->TickAnimations(base::TimeTicks(), scroll_tree, false));
}

TEST_F(AnimationHostTest, TickScrollLinkedAnimationNonCompositedScroll) {
  client_.RegisterElementId(element_id_, ElementListType::ACTIVE);
  client_impl_.RegisterElementId(element_id_, ElementListType::PENDING);
  client_impl_.RegisterElementId(element_id_, ElementListType::ACTIVE);
  PropertyTrees property_trees(*host_impl_);
  property_trees.set_is_main_thread(false);
  property_trees.set_is_active(true);
  CreateScrollingNodeForElement(element_id_, &property_trees,
                                /*is_composited=*/false);

  // Create scroll timeline that links scroll animation and scroll-linked
  // animation together.
  ScrollTimeline::ScrollOffsets scroll_offsets(0, 100);
  auto scroll_timeline = ScrollTimeline::Create(
      element_id_, ScrollTimeline::ScrollDown, scroll_offsets);

  int animation_id = 11;
  // Create an animation that is bound to the scroll timeline.
  scoped_refptr<Animation> animation = Animation::Create(animation_id);
  host_impl_->AddAnimationTimeline(scroll_timeline);
  scroll_timeline->AttachAnimation(animation);

  ASSERT_TRUE(animation->IsScrollLinkedAnimation());

  animation->AttachElement(element_id_);

  AddOpacityTransitionToAnimation(animation.get(), 1, .7f, .3f, true);
  auto* keyframe_model = animation->GetKeyframeModel(TargetProperty::OPACITY);
  EXPECT_EQ(keyframe_model->run_state(),
            KeyframeModel::WAITING_FOR_TARGET_AVAILABILITY);

  auto& scroll_tree = property_trees.scroll_tree_mutable();
  SetScrollOffset(&property_trees, element_id_, gfx::PointF(0, 20));
  EXPECT_TRUE(
      host_impl_->TickAnimations(base::TimeTicks(), scroll_tree, false));

  EXPECT_EQ(keyframe_model->run_state(), KeyframeModel::STARTING);
  double tick_time = (scroll_timeline->CurrentTime(scroll_tree, false).value() -
                      base::TimeTicks())
                         .InMillisecondsF();
  EXPECT_EQ(tick_time, 0);

  auto* synced_offset = scroll_tree.GetSyncedScrollOffset(element_id_);
  // Simulate that the main thread commits a different scroll offset.
  synced_offset->PushMainToPending(gfx::PointF(0, 10));
  synced_offset->PushPendingToActive();
  EXPECT_TRUE(
      host_impl_->TickAnimations(base::TimeTicks(), scroll_tree, false));
  tick_time = ToMilliseconds(scroll_timeline->CurrentTime(scroll_tree, false));
  double duration =
      ToMilliseconds(scroll_timeline->Duration(scroll_tree, false));
  EXPECT_NEAR(tick_time, 0.1 * duration, 1e-6);

  scroll_timeline->DetachAnimation(animation);
  EXPECT_FALSE(
      host_impl_->TickAnimations(base::TimeTicks(), scroll_tree, false));
}

TEST_F(AnimationHostTest, TickScrollLinkedAnimationSmooth) {
  ElementId element_id = element_id_;
  const int linked_animation_id = 11;
  const int scroll_animation_id = 12;

  client_.RegisterElementId(element_id, ElementListType::ACTIVE);
  client_impl_.RegisterElementId(element_id, ElementListType::PENDING);
  client_impl_.RegisterElementId(element_id, ElementListType::ACTIVE);
  host_impl_->AddAnimationTimeline(timeline_);

  PropertyTrees property_trees(*host_impl_);
  property_trees.set_is_main_thread(false);
  property_trees.set_is_active(true);
  CreateScrollingNodeForElement(element_id, &property_trees);
  const auto& scroll_tree = property_trees.scroll_tree();

  ScrollTimeline::ScrollOffsets scroll_offsets(0, 100);
  auto scroll_timeline = ScrollTimeline::Create(
      element_id, ScrollTimeline::ScrollDown, scroll_offsets);

  scoped_refptr<Animation> animation = Animation::Create(linked_animation_id);
  host_impl_->AddAnimationTimeline(scroll_timeline);
  scroll_timeline->AttachAnimation(animation);
  animation->AttachElement(element_id);
  double duration =
      0.001 * ToMilliseconds(scroll_timeline->Duration(scroll_tree, false));
  AddOpacityTransitionToAnimation(animation.get(), duration, .7f, .3f, true);
  auto* keyframe_model = animation->GetKeyframeModel(TargetProperty::OPACITY);
  keyframe_model->set_needs_synchronized_start_time(false);

  host_impl_->TickAnimations(base::TimeTicks(), scroll_tree, false);
  TickAnimationsTransferEvents(base::TimeTicks(), 1u);

  scoped_refptr<MockAnimation> mock_scroll_animation(
      new MockAnimation(scroll_animation_id));
  EXPECT_CALL(*mock_scroll_animation, Tick(_))
      .WillOnce(InvokeWithoutArgs([&]() -> bool {
        SetScrollOffset(&property_trees, element_id, gfx::PointF(0, 50));
        return true;
      }));
  timeline_->AttachAnimation(mock_scroll_animation);
  host_impl_->AddToTicking(mock_scroll_animation);

  // This should tick the scroll animation first, and then the opacity animation
  // that depends on the scroll position.
  host_impl_->TickAnimations(base::TimeTicks(), scroll_tree, false);

  const float expected_opacity = 0.5;
  client_impl_.ExpectOpacityPropertyMutated(element_id, ElementListType::ACTIVE,
                                            expected_opacity);
}

TEST_F(AnimationHostTest, PushPropertiesToImpl) {
  TestHostClient host_client(ThreadInstance::kMain);
  AnimationHost* host = host_client.host();
  TestHostClient host_impl_client(ThreadInstance::kImpl);
  AnimationHost* host_impl = host_impl_client.host();

  host->SetHasCanvasInvalidation(true);
  host->SetHasInlineStyleMutation(true);

  EXPECT_FALSE(host_impl->HasCanvasInvalidation());
  EXPECT_FALSE(host_impl->HasJSAnimation());

  host->PushPropertiesTo(host_impl, client_.GetPropertyTrees());
  EXPECT_TRUE(host_impl->HasCanvasInvalidation());
  EXPECT_TRUE(host_impl->HasJSAnimation());
}

TEST_F(AnimationHostTest, ScrollTimelineOffsetUpdatedByScrollAnimation) {
  client_.RegisterElementId(element_id_, ElementListType::ACTIVE);
  client_impl_.RegisterElementId(element_id_, ElementListType::PENDING);
  client_impl_.RegisterElementId(element_id_, ElementListType::ACTIVE);
  host_impl_->AddAnimationTimeline(timeline_);

  PropertyTrees property_trees(*host_impl_);
  property_trees.set_is_main_thread(false);
  property_trees.set_is_active(true);
  CreateScrollingNodeForElement(element_id_, &property_trees);

  int animation_id = 11;
  scoped_refptr<MockAnimation> mock_scroll_animation(
      new MockAnimation(animation_id));
  EXPECT_CALL(*mock_scroll_animation, Tick(_))
      .WillOnce(InvokeWithoutArgs([&]() -> bool {
        // Scroll to 20% of the max value.
        SetScrollOffset(&property_trees, element_id_, gfx::PointF(0, 20));
        return true;
      }));

  // Ensure scroll animation is ticking.
  timeline_->AttachAnimation(mock_scroll_animation);
  host_impl_->AddToTicking(mock_scroll_animation);

  ScrollTimeline::ScrollOffsets scroll_offsets(0, 100);
  auto scroll_timeline = ScrollTimeline::Create(
      element_id_, ScrollTimeline::ScrollDown, scroll_offsets);

  host_impl_->TickAnimations(base::TimeTicks(), property_trees.scroll_tree(),
                             false);

  double tick_time = ToMilliseconds(
      scroll_timeline->CurrentTime(property_trees.scroll_tree(), false));
  double duration = ToMilliseconds(
      scroll_timeline->Duration(property_trees.scroll_tree(), false));
  EXPECT_NEAR(tick_time, 0.2 * duration, 1e-6);
}

}  // namespace
}  // namespace cc