Move frame eviction into components

components/display_compositor/frame_evictor.h

+// Copyright 2013 The Chromium Authors. All rights reserved.

[Fady Samuel, 2017/04/12 03:17:02]

nit: 2017

+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_DISPLAY_COMPOSITOR_FRAME_EVICTOR_H_
+#define COMPONENTS_DISPLAY_COMPOSITOR_FRAME_EVICTOR_H_
+
+#include "base/macros.h"
+#include "components/display_compositor/display_compositor_export.h"
+#include "components/display_compositor/frame_eviction_manager.h"
+
+namespace display_compositor {
+
+class DISPLAY_COMPOSITOR_EXPORT FrameEvictorClient {
+ public:
+  virtual ~FrameEvictorClient() {}
+  virtual void EvictDelegatedFrame() = 0;
+};
+
+class DISPLAY_COMPOSITOR_EXPORT FrameEvictor
+    : public FrameEvictionManagerClient {
+ public:
+  // |client| must outlive |this|.
+  explicit FrameEvictor(FrameEvictorClient* client);
+  ~FrameEvictor() override;
+
+  void SwappedFrame(bool visible);
+  void DiscardedFrame();
+  void SetVisible(bool visible);
+  void LockFrame();
+  void UnlockFrame();
+  bool HasFrame() { return has_frame_; }
+
+ private:
+  // FrameEvictionManagerClient implementation.
+  void EvictCurrentFrame() override;
+
+  FrameEvictorClient* client_;
+  bool has_frame_;
+  bool visible_;
+
+  DISALLOW_COPY_AND_ASSIGN(FrameEvictor);
+};
+
+}  // namespace display_compositor
+
+#endif  // COMPONENTS_DISPLAY_COMPOSITOR_FRAME_EVICTOR_H_