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

chrome/common/plugin_messages_internal.h

Index: chrome/common/plugin_messages_internal.h
===================================================================
--- chrome/common/plugin_messages_internal.h	(revision 8043)
+++ chrome/common/plugin_messages_internal.h	(working copy)
@@ -81,6 +81,15 @@
                               int /* network error */,
                               std::string /* proxy list */)
 
+  // Creates a child window of the given parent window on the UI thread.
+  IPC_SYNC_MESSAGE_CONTROL1_1(PluginProcessHostMsg_CreateWindow,
+                              HWND /* parent */,
+                              HWND /* child */)
+
+  // Destroys the given window on the UI thread.
+  IPC_MESSAGE_CONTROL1(PluginProcessHostMsg_DestroyWindow,
+                              HWND /* window */)

[darin (slow to review), 2009/01/16 22:08:39]

nit: indentation

+
 IPC_END_MESSAGES(PluginProcessHost)
 
 
@@ -131,11 +140,9 @@
   // contains a buffer that the plugin draws into.  background_buffer is used
   // for transparent windowless plugins, and holds the background of the plugin
   // rectangle.
-  IPC_MESSAGE_ROUTED6(PluginMsg_UpdateGeometry,
+  IPC_MESSAGE_ROUTED4(PluginMsg_UpdateGeometry,
                       gfx::Rect /* window_rect */,
                       gfx::Rect /* clip_rect */,
-                      std::vector<gfx::Rect> /* cutout_rects */,
-                      bool /* visible */,
                       base::SharedMemoryHandle /* windowless_buffer */,
                       base::SharedMemoryHandle /* background_buffer */)