WIP: Towards merging OffscreenCanvas and Mus code

content/browser/renderer_host/offscreen_canvas_surface_manager.h

-// Copyright 2016 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_OFFSCREEN_CANVAS_SURFACE_MANAGER_H_
-#define CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_MANAGER_H_
-
-#include "base/memory/weak_ptr.h"
-#include "cc/surfaces/surface_id.h"
-#include "cc/surfaces/surface_observer.h"
-#include "content/browser/renderer_host/offscreen_canvas_surface_impl.h"
-
-namespace content {
-
-class CONTENT_EXPORT OffscreenCanvasSurfaceManager
-    : public cc::SurfaceObserver {
- public:
-  OffscreenCanvasSurfaceManager();
-  virtual ~OffscreenCanvasSurfaceManager();
-
-  static OffscreenCanvasSurfaceManager* GetInstance();
-
-  // Registration of the frame sink with the given frame sink id to its parent
-  // frame sink (if it has one), so that parent frame is able to send signals
-  // to it on begin frame.
-  void RegisterFrameSinkToParent(const cc::FrameSinkId& frame_sink_id);
-  void UnregisterFrameSinkFromParent(const cc::FrameSinkId& frame_sink_id);
-
-  void RegisterOffscreenCanvasSurfaceInstance(
-      const cc::FrameSinkId& frame_sink_id,
-      OffscreenCanvasSurfaceImpl* offscreen_canvas_surface);
-  void UnregisterOffscreenCanvasSurfaceInstance(
-      const cc::FrameSinkId& frame_sink_id);
-  OffscreenCanvasSurfaceImpl* GetSurfaceInstance(
-      const cc::FrameSinkId& frame_sink_id);
-
- private:
-  friend class OffscreenCanvasSurfaceManagerTest;
-
-  // cc::SurfaceObserver implementation.
-  void OnSurfaceCreated(const cc::SurfaceInfo& surface_info) override;
-  void OnSurfaceDamaged(const cc::SurfaceId&, bool* changed) override {}
-
-  // When an OffscreenCanvasSurfaceImpl instance is destructed, it will
-  // unregister the corresponding entry from this map.
-  std::unordered_map<cc::FrameSinkId,
-                     OffscreenCanvasSurfaceImpl*,
-                     cc::FrameSinkIdHash>
-      registered_surface_instances_;
-  DISALLOW_COPY_AND_ASSIGN(OffscreenCanvasSurfaceManager);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_RENDERER_HOST_OFFSCREEN_CANVAS_SURFACE_MANAGER_H_