Make it easier to create new IPC channel types (i.e. renderer/plugin). Inste...

chrome/common/render_messages_internal.h

Index: chrome/common/render_messages_internal.h
===================================================================
--- chrome/common/render_messages_internal.h	(revision 9103)
+++ chrome/common/render_messages_internal.h	(working copy)
@@ -25,8 +25,6 @@
 #include "webkit/glue/webinputevent.h"
 #include "webkit/glue/webplugin.h"
 
-void RenderMessagesInit();
-
 // TODO(mpcomplete): rename ViewMsg and ViewHostMsg to something that makes
 // more sense with our current design.
 
@@ -34,7 +32,7 @@
 // RenderView messages
 // These are messages sent from the browser to the renderer process.
 
-IPC_BEGIN_MESSAGES(View, 1)
+IPC_BEGIN_MESSAGES(View)
   // Used typically when recovering from a crash.  The new rendering process
   // sets its global "next page id" counter to the given value.
   IPC_MESSAGE_CONTROL1(ViewMsg_SetNextPageID,
@@ -486,7 +484,7 @@
 // WebContents messages
 // These are messages sent from the renderer to the browser process.
 
-IPC_BEGIN_MESSAGES(ViewHost, 2)
+IPC_BEGIN_MESSAGES(ViewHost)
   // Sent by the renderer when it is creating a new window.  The browser creates
   // a tab for it and responds with a ViewMsg_CreatingNew_ACK.  If route_id is
   // MSG_ROUTING_NONE, the view couldn't be created.  modal_dialog_event is set
@@ -738,9 +736,11 @@
   IPC_MESSAGE_CONTROL3(ViewHostMsg_PageContents, GURL, int32, std::wstring)
 
   // Specifies the URL as the first parameter (a wstring) and thumbnail as
-  // binary data as the second parameter. Our macros don't handle binary data,
-  // so this is declared "empty," to be encoded by the caller/receiver.
-  IPC_MESSAGE_EMPTY(ViewHostMsg_Thumbnail)
+  // binary data as the second parameter.
+  IPC_MESSAGE_ROUTED3(ViewHostMsg_Thumbnail,
+                      GURL /* url */,
+                      ThumbnailScore /* score */,
+                      SkBitmap /* bitmap */)
 
   // Notification that the url for the favicon of a site has been determined.
   IPC_MESSAGE_ROUTED2(ViewHostMsg_UpdateFavIconURL,