Very basic Android browser-side compositing support.

content/public/browser/android/draw_delegate.h

-// Copyright (c) 2012 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_PUBLIC_BROWSER_ANDROID_DRAW_DELEGATE_H_
-#define CONTENT_PUBLIC_BROWSER_ANDROID_DRAW_DELEGATE_H_
-
-#include "base/callback.h"
-#include "ui/gfx/native_widget_types.h"
-#include "ui/gfx/size.h"
-
-namespace content {
-
-class RenderWidgetHostView;
-
-// This interface facilitates the communication between compositor and
-// UI with respect to new frames arriving and acknowledging when they
-// have been presented.
-class DrawDelegate {
- public:
-  static DrawDelegate* GetInstance();
-  virtual ~DrawDelegate() { }
-
-  // Callback to be run after the frame has been drawn. It passes back
-  // a synchronization point identifier.
-  typedef base::Callback<void(uint32)> SurfacePresentedCallback;
-
-  // Notification to the UI that the surface identified by the texture id
-  // has been updated.
-  typedef base::Callback<void(
-      uint64,
-      RenderWidgetHostView*,
-      const SurfacePresentedCallback&)> SurfaceUpdatedCallback;
-
-  virtual void SetUpdateCallback(const SurfaceUpdatedCallback& callback) = 0;
-  virtual void SetBounds(const gfx::Size& size) = 0;
-};
-
-}  // namespace content
-
-#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_DRAW_DELEGATE_H_