ContentShell rendering support on Android.

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(gfx::Size& size) = 0;

[jam, 2012/07/31 22:46:15]

nit: const ref

+};
+
+}  // namespace content
+
+#endif  // CONTENT_PUBLIC_BROWSER_ANDROID_DRAW_DELEGATE_H_