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// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "components/performance_manager/execution_context_priority/frame_visibility_voter.h"
#include <utility>
#include "components/performance_manager/public/execution_context/execution_context_registry.h"
#include "components/performance_manager/public/features.h"
#include "components/performance_manager/public/graph/graph.h"
#include "url/gurl.h"
namespace performance_manager {
namespace execution_context_priority {
namespace {
const execution_context::ExecutionContext* GetExecutionContext(
const FrameNode* frame_node) {
return execution_context::ExecutionContextRegistry::GetFromGraph(
frame_node->GetGraph())
->GetExecutionContextForFrameNode(frame_node);
}
// Returns a vote with the appropriate priority depending on the frame's
// |visibility|.
Vote GetVote(FrameNode::Visibility visibility, bool is_important) {
base::TaskPriority priority;
switch (visibility) {
case FrameNode::Visibility::kUnknown:
priority = base::TaskPriority::USER_BLOCKING;
break;
case FrameNode::Visibility::kVisible: {
priority = is_important ? base::TaskPriority::USER_BLOCKING
: base::TaskPriority::USER_VISIBLE;
break;
}
case FrameNode::Visibility::kNotVisible:
priority = base::TaskPriority::LOWEST;
break;
}
return Vote(priority, FrameVisibilityVoter::kFrameVisibilityReason);
}
} // namespace
// static
const char FrameVisibilityVoter::kFrameVisibilityReason[] = "Frame visibility.";
FrameVisibilityVoter::FrameVisibilityVoter() = default;
FrameVisibilityVoter::~FrameVisibilityVoter() = default;
void FrameVisibilityVoter::InitializeOnGraph(Graph* graph,
VotingChannel voting_channel) {
voting_channel_ = std::move(voting_channel);
graph->AddFrameNodeObserver(this);
}
void FrameVisibilityVoter::TearDownOnGraph(Graph* graph) {
graph->RemoveFrameNodeObserver(this);
voting_channel_.Reset();
}
void FrameVisibilityVoter::OnBeforeFrameNodeAdded(
const FrameNode* frame_node,
const FrameNode* pending_parent_frame_node,
const PageNode* pending_page_node,
const ProcessNode* pending_process_node,
const FrameNode* pending_parent_or_outer_document_or_embedder) {
const Vote vote =
GetVote(frame_node->GetVisibility(), frame_node->IsImportant());
voting_channel_.SubmitVote(GetExecutionContext(frame_node), vote);
}
void FrameVisibilityVoter::OnBeforeFrameNodeRemoved(
const FrameNode* frame_node) {
voting_channel_.InvalidateVote(GetExecutionContext(frame_node));
}
void FrameVisibilityVoter::OnFrameVisibilityChanged(
const FrameNode* frame_node,
FrameNode::Visibility previous_value) {
const Vote old_vote = GetVote(previous_value, frame_node->IsImportant());
const Vote new_vote =
GetVote(frame_node->GetVisibility(), frame_node->IsImportant());
// Nothing to change if the new priority is the same as the old one.
if (new_vote == old_vote) {
return;
}
voting_channel_.ChangeVote(GetExecutionContext(frame_node), new_vote);
}
void FrameVisibilityVoter::OnIsImportantChanged(const FrameNode* frame_node) {
const Vote old_vote =
GetVote(frame_node->GetVisibility(), !frame_node->IsImportant());
const Vote new_vote =
GetVote(frame_node->GetVisibility(), frame_node->IsImportant());
// Nothing to change if the new priority is the same as the old one.
if (new_vote == old_vote) {
return;
}
voting_channel_.ChangeVote(GetExecutionContext(frame_node), new_vote);
}
} // namespace execution_context_priority
} // namespace performance_manager
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