Move frame eviction into components

content/browser/renderer_host/delegated_frame_evictor.h

-// Copyright 2013 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.
-
-#ifndef CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_
-#define CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_
-
-#include "base/macros.h"
-#include "content/browser/renderer_host/renderer_frame_manager.h"
-#include "content/common/content_export.h"
-
-namespace content {
-
-class CONTENT_EXPORT DelegatedFrameEvictorClient {
- public:
-  virtual ~DelegatedFrameEvictorClient() {}
-  virtual void EvictDelegatedFrame() = 0;
-};
-
-class CONTENT_EXPORT DelegatedFrameEvictor : public RendererFrameManagerClient {
- public:
-  // |client| must outlive |this|.
-  explicit DelegatedFrameEvictor(DelegatedFrameEvictorClient* client);
-  ~DelegatedFrameEvictor() override;
-
-  void SwappedFrame(bool visible);
-  void DiscardedFrame();
-  void SetVisible(bool visible);
-  void LockFrame();
-  void UnlockFrame();
-  bool HasFrame() { return has_frame_; }
-
- private:
-  // RendererFrameManagerClient implementation.
-  void EvictCurrentFrame() override;
-
-  DelegatedFrameEvictorClient* client_;
-  bool has_frame_;
-  bool visible_;
-
-  DISALLOW_COPY_AND_ASSIGN(DelegatedFrameEvictor);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_DELEGATED_FRAME_EVICTOR_H_