Add a RenderProcessObserver. For now this will be primarily used to filter control messages, so ...

chrome/renderer/render_thread.h

Index: chrome/renderer/render_thread.h
===================================================================
--- chrome/renderer/render_thread.h	(revision 79468)
+++ chrome/renderer/render_thread.h	(working copy)
@@ -6,6 +6,7 @@
 #define CHROME_RENDERER_RENDER_THREAD_H_
 #pragma once
 
+#include <list>
 #include <map>
 #include <string>
 #include <vector>
@@ -34,6 +35,7 @@
 class ListValue;
 class RendererHistogram;
 class RendererHistogramSnapshots;
+class RenderProcessObserver;
 class RendererNetPredictor;
 class RendererWebKitClientImpl;
 class SpellCheck;
@@ -413,6 +415,9 @@
 
   chrome::ChromeContentRendererClient renderer_client_;
 
+  typedef std::list<RenderProcessObserver*> RenderProcessObserverList;
+  RenderProcessObserverList observers_;

[brettw, 2011/03/26 18:08:48]

I wonder if this should be a base::ObserverList in case one of the callbacks
starts modifying the list in a notification. If we're not worried about
modification, I'd just use a vector which should be less overhead than a list.

[jam, 2011/03/27 22:55:47]

I've switched to ObserverList just to be safe.

+
   DISALLOW_COPY_AND_ASSIGN(RenderThread);
 };