Fix Silverlight windowless plugin painting issues. This fixes the following...

chrome/plugin/webplugin_proxy.h

Index: chrome/plugin/webplugin_proxy.h
===================================================================
--- chrome/plugin/webplugin_proxy.h	(revision 5778)
+++ chrome/plugin/webplugin_proxy.h	(working copy)
@@ -108,6 +108,9 @@
                      ScopedBitmap* bitmap,
                      ScopedHDC* hdc);
 
+  // Handler for sending over the paint event to the plugin.
+  void OnPaint(const gfx::Rect& damaged_rect);
+
   // Called when a plugin's origin moves, so that we can update the world
   // transform of the local HDC.
   void UpdateTransform();
@@ -137,6 +140,8 @@
   ScopedHandle background_shared_section_;
   ScopedBitmap background_bitmap_;
   ScopedHDC background_hdc_;
+
+  ScopedRunnableMethodFactory<WebPluginProxy> runnable_method_factory_;
 };
 
 #endif  // CHROME_PLUGIN_PLUGIN_WEBPLUGIN_PROXY_H__