chromium/components/performance_manager/execution_context_priority/frame_visibility_voter.h

// 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.

#ifndef COMPONENTS_PERFORMANCE_MANAGER_EXECUTION_CONTEXT_PRIORITY_FRAME_VISIBILITY_VOTER_H_
#define COMPONENTS_PERFORMANCE_MANAGER_EXECUTION_CONTEXT_PRIORITY_FRAME_VISIBILITY_VOTER_H_

#include "components/performance_manager/execution_context_priority/voter_base.h"
#include "components/performance_manager/graph/initializing_frame_node_observer.h"
#include "components/performance_manager/public/execution_context_priority/execution_context_priority.h"

namespace performance_manager {
namespace execution_context_priority {

// This voter tracks frame nodes and casts a vote for each of them, whose value
// depends on their visibility. A visible frame will receive a
// TaskPriority::USER_BLOCKING vote, while a non-visible frame will receive a
// TaskPriority::LOWEST vote.
// Note: Uses `InitializingFrameNodeObserver` because it can affect the initial
// priority of a frame.
class FrameVisibilityVoter : public VoterBase,
                             public InitializingFrameNodeObserver { … };

}  // namespace execution_context_priority
}  // namespace performance_manager

#endif  // COMPONENTS_PERFORMANCE_MANAGER_EXECUTION_CONTEXT_PRIORITY_FRAME_VISIBILITY_VOTER_H_