Improve scrolling performance when there are many windowed plugins in a page....

chrome/renderer/webplugin_delegate_proxy.h

 // Copyright (c) 2006-2008 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 CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H__
 #define CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H__
 
 #include <set>
 #include <string>
 
@@ skipping 34 matching lines @@
   void DropWindowScriptObject() { window_script_object_ = NULL; }
 
   // Called to flush any deferred geometry changes to the plugin process.
   virtual void FlushGeometryUpdates();
 
   // WebPluginDelegate implementation:
   virtual void PluginDestroyed();
   virtual bool Initialize(const GURL& url, char** argn, char** argv, int argc,
                           WebPlugin* plugin, bool load_manually);
   virtual void UpdateGeometry(const gfx::Rect& window_rect,
-                              const gfx::Rect& clip_rect,
-                              const std::vector<gfx::Rect>& cutout_rects,
-                              bool visible);
+                              const gfx::Rect& clip_rect);
   virtual void Paint(HDC hdc, const gfx::Rect& rect);
   virtual void Print(HDC hdc);
   virtual NPObject* GetPluginScriptableObject();
   virtual void DidFinishLoadWithReason(NPReason reason);
   virtual void SetFocus();
   virtual bool HandleEvent(NPEvent* event, WebCursor* cursor);
   virtual int GetProcessId();
 
   // IPC::Channel::Listener implementation:
   virtual void OnMessageReceived(const IPC::Message& msg);
@@ skipping 83 matching lines @@
   WebPlugin* plugin_;
   bool windowless_;
   scoped_refptr<PluginChannelHost> channel_host_;
   std::string mime_type_;
   std::string clsid_;
   int instance_id_;
   FilePath plugin_path_;
 
   gfx::Rect plugin_rect_;
   gfx::Rect deferred_clip_rect_;
-  std::vector<gfx::Rect> deferred_cutout_rects_;
   bool send_deferred_update_geometry_;
-  bool visible_;
 
   NPObject* npobject_;
   NPObjectStub* window_script_object_;
 
   // Event passed in by the plugin process and is used to decide if
   // messages need to be pumped in the NPP_HandleEvent sync call.
   ScopedHandle modal_loop_pump_messages_event_;
 
   // Bitmap for crashed plugin
   SkBitmap* sad_plugin_;
@@ skipping 14 matching lines @@
   scoped_ptr<base::SharedMemory> background_store_;
   scoped_ptr<skia::PlatformCanvasWin> background_store_canvas_;
   // This lets us know which portion of the backing store has been painted into.
   gfx::Rect backing_store_painted_;
 
   DISALLOW_EVIL_CONSTRUCTORS(WebPluginDelegateProxy);
 };
 
 #endif  // #ifndef CHROME_RENDERER_WEBPLUGIN_DELEGATE_PROXY_H__