Use optimized scrolling for pepper plugins.

webkit/glue/plugins/pepper_fullscreen_container.h

 // Copyright (c) 2010 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 WEBKIT_GLUE_PLUGINS_PEPPER_FULLSCREEN_CONTAINER_H_
 #define WEBKIT_GLUE_PLUGINS_PEPPER_FULLSCREEN_CONTAINER_H_
 
 namespace WebKit {
 struct WebRect;
 }  // namespace WebKit
 
 namespace pepper {
 
 // This class is like a lightweight WebPluginContainer for fullscreen pepper
 // plugins, that only handles painting.
 class FullscreenContainer {
  public:
   virtual ~FullscreenContainer() {}
 
   // Invalidates the full plugin region.
   virtual void Invalidate() = 0;
 
   // Invalidates a partial region of the plugin.
   virtual void InvalidateRect(const WebKit::WebRect&) = 0;
 
+  // Scrolls a partial region of the plugin in the given direction.
+  virtual void ScrollRect(int dx, int dy, const WebKit::WebRect&) = 0;
+
   // Destroys the fullscreen window. This also destroys the FullscreenContainer
   // instance.
   virtual void Destroy() = 0;
 };
 
 }  // namespace pepper
 
 #endif  // WEBKIT_GLUE_PLUGINS_PEPPER_FULLSCREEN_CONTAINER_H_