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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <memory>
#include "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/run_loop.h"
#include "base/test/metrics/histogram_tester.h"
#include "content/browser/renderer_host/input/synthetic_gesture.h"
#include "content/browser/renderer_host/input/synthetic_gesture_controller.h"
#include "content/browser/renderer_host/input/synthetic_gesture_target.h"
#include "content/browser/renderer_host/input/synthetic_smooth_scroll_gesture.h"
#include "content/browser/renderer_host/render_widget_host_impl.h"
#include "content/browser/web_contents/web_contents_impl.h"
#include "content/common/input/synthetic_gesture_params.h"
#include "content/common/input/synthetic_smooth_scroll_gesture_params.h"
#include "content/public/browser/render_view_host.h"
#include "content/public/browser/render_widget_host_view.h"
#include "content/public/test/browser_test_utils.h"
#include "content/public/test/content_browser_test.h"
#include "content/public/test/content_browser_test_utils.h"
#include "content/shell/browser/shell.h"
namespace {
const char kDataURL[] =
"data:text/html;charset=utf-8,"
"<!DOCTYPE html>"
"<html>"
"<head>"
"<title>Scroll latency histograms browsertests.</title>"
"<script src=\"../../resources/testharness.js\"></script>"
"<script src=\"../../resources/testharnessreport.js\"></script>"
"<style>"
"body {"
" height:3000px;"
"}"
"</style>"
"</head>"
"<body>"
"<div id='spinner'>Spinning</div>"
"</body>"
"<script>"
"var degree = 0;"
"function spin() {"
"degree = degree + 3;"
"if (degree >= 360)"
"degree -= 360;"
"document.getElementById('spinner').style['transform'] = "
"'rotate(' + degree + 'deg)';"
"requestAnimationFrame(spin);"
"}"
"spin();"
"</script>"
"</html>";
} // namespace
namespace content {
class ScrollLatencyBrowserTest : public ContentBrowserTest {
public:
ScrollLatencyBrowserTest() : loop_(base::MessageLoop::TYPE_UI) {}
~ScrollLatencyBrowserTest() override {}
RenderWidgetHostImpl* GetWidgetHost() {
return RenderWidgetHostImpl::From(
shell()->web_contents()->GetRenderViewHost()->GetWidget());
}
// TODO(tdresser): Find a way to avoid sleeping like this. See
// crbug.com/405282 for details.
void GiveItSomeTime() {
base::RunLoop run_loop;
base::ThreadTaskRunnerHandle::Get()->PostDelayedTask(
FROM_HERE, run_loop.QuitClosure(),
base::TimeDelta::FromMillisecondsD(10));
run_loop.Run();
}
void WaitAFrame() {
while (!GetWidgetHost()->RequestRepaintForTesting())
GiveItSomeTime();
frame_observer_->Wait();
}
void OnSyntheticGestureCompleted(SyntheticGesture::Result result) {
EXPECT_EQ(SyntheticGesture::GESTURE_FINISHED, result);
run_loop_->Quit();
}
protected:
void LoadURL() {
const GURL data_url(kDataURL);
NavigateToURL(shell(), data_url);
RenderWidgetHostImpl* host = GetWidgetHost();
host->GetView()->SetSize(gfx::Size(400, 400));
frame_observer_ = std::make_unique<MainThreadFrameObserver>(
shell()->web_contents()->GetRenderViewHost()->GetWidget());
// Wait a frame to make sure the page has renderered.
WaitAFrame();
frame_observer_.reset();
}
// Generate a single wheel tick, scrolling by |distance|. This will perform a
// smooth scroll on platforms which support it.
void DoSmoothWheelScroll(const gfx::Vector2d& distance) {
blink::WebGestureEvent event =
SyntheticWebGestureEventBuilder::BuildScrollBegin(
distance.x(), -distance.y(),
blink::WebGestureDevice::kWebGestureDeviceTouchpad, 1);
event.data.scroll_begin.delta_hint_units =
blink::WebGestureEvent::ScrollUnits::kPixels;
GetWidgetHost()->ForwardGestureEvent(event);
blink::WebGestureEvent event2 =
SyntheticWebGestureEventBuilder::BuildScrollUpdate(
distance.x(), -distance.y(), 0,
blink::WebGestureDevice::kWebGestureDeviceTouchpad);
event2.data.scroll_update.delta_units =
blink::WebGestureEvent::ScrollUnits::kPixels;
GetWidgetHost()->ForwardGestureEvent(event2);
}
// Returns true if the given histogram has recorded the expected number of
// samples.
bool VerifyRecordedSamplesForHistogram(
const size_t num_samples,
const std::string& histogram_name) const {
return num_samples ==
histogram_tester_.GetAllSamples(histogram_name).size();
}
std::unique_ptr<base::RunLoop> run_loop_;
private:
base::HistogramTester histogram_tester_;
base::MessageLoop loop_;
std::unique_ptr<MainThreadFrameObserver> frame_observer_;
DISALLOW_COPY_AND_ASSIGN(ScrollLatencyBrowserTest);
};
// Perform a smooth wheel scroll, and verify that our end-to-end wheel latency
// metric is recorded. See crbug.com/599910 for details.
IN_PROC_BROWSER_TEST_F(ScrollLatencyBrowserTest, SmoothWheelScroll) {
LoadURL();
DoSmoothWheelScroll(gfx::Vector2d(0, 100));
while (!VerifyRecordedSamplesForHistogram(
1, "Event.Latency.ScrollBegin.Wheel.TimeToScrollUpdateSwapBegin2")) {
GiveItSomeTime();
FetchHistogramsFromChildProcesses();
}
}
// Do an upward wheel scroll, and verify that no scroll metrics is recorded when
// the scroll event is ignored.
IN_PROC_BROWSER_TEST_F(ScrollLatencyBrowserTest,
ScrollLatencyNotRecordedIfGSUIgnored) {
LoadURL();
auto scroll_update_watcher = std::make_unique<InputMsgWatcher>(
GetWidgetHost(), blink::WebInputEvent::kGestureScrollUpdate);
// Try to scroll upward, the GSU(s) will get ignored since the scroller is at
// its extent.
SyntheticSmoothScrollGestureParams params;
params.gesture_source_type = SyntheticGestureParams::TOUCH_INPUT;
params.anchor = gfx::PointF(10, 10);
params.distances.push_back(gfx::Vector2d(0, 60));
run_loop_ = std::make_unique<base::RunLoop>();
std::unique_ptr<SyntheticSmoothScrollGesture> gesture(
new SyntheticSmoothScrollGesture(params));
GetWidgetHost()->QueueSyntheticGesture(
std::move(gesture),
base::BindOnce(&ScrollLatencyBrowserTest::OnSyntheticGestureCompleted,
base::Unretained(this)));
// Runs until we get the OnSyntheticGestureCompleted callback and verify that
// the first GSU event is ignored.
run_loop_->Run();
EXPECT_EQ(INPUT_EVENT_ACK_STATE_NO_CONSUMER_EXISTS,
scroll_update_watcher->GetAckStateWaitIfNecessary());
// Wait for one frame and then verify that the scroll metrics are not
// recorded.
std::unique_ptr<RenderFrameSubmissionObserver> frame_observer =
std::make_unique<RenderFrameSubmissionObserver>(
GetWidgetHost()->render_frame_metadata_provider());
frame_observer->WaitForAnyFrameSubmission();
FetchHistogramsFromChildProcesses();
EXPECT_TRUE(VerifyRecordedSamplesForHistogram(
0, "Event.Latency.ScrollBegin.Touch.BrowserNotifiedToBeforeGpuSwap2"));
EXPECT_TRUE(VerifyRecordedSamplesForHistogram(
0, "Event.Latency.ScrollBegin.Touch.GpuSwap2"));
EXPECT_TRUE(VerifyRecordedSamplesForHistogram(
0, "Event.Latency.ScrollBegin.Touch.HandledToRendererSwap2_Impl"));
EXPECT_TRUE(VerifyRecordedSamplesForHistogram(
0, "Event.Latency.ScrollBegin.Touch.RendererSwapToBrowserNotified2"));
EXPECT_TRUE(VerifyRecordedSamplesForHistogram(
0, "Event.Latency.ScrollBegin.Touch.TimeToHandled2_Impl"));
EXPECT_TRUE(VerifyRecordedSamplesForHistogram(
0, "Event.Latency.ScrollBegin.Touch.TimeToScrollUpdateSwapBegin2"));
}
} // namespace content
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