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

chrome/renderer/render_thread.cc

Index: chrome/renderer/render_thread.cc
===================================================================
--- chrome/renderer/render_thread.cc	(revision 79468)
+++ chrome/renderer/render_thread.cc	(working copy)
@@ -67,6 +67,7 @@
 #include "content/renderer/gpu_video_service_host.h"
 #include "content/renderer/indexed_db_dispatcher.h"
 #include "content/renderer/plugin_channel_host.h"
+#include "content/renderer/render_process_observer.h"
 #include "content/renderer/render_view.h"
 #include "content/renderer/render_view_visitor.h"
 #include "content/renderer/renderer_webidbfactory_impl.h"
@@ -331,6 +332,11 @@
 }
 
 RenderThread::~RenderThread() {
+  for (RenderProcessObserverList::iterator i = observers_.begin();
+       i != observers_.end(); ++i) {
+    (*i)->OnRenderProcessShutdown();
+  }
+
   // Wait for all databases to be closed.
   if (web_database_observer_impl_.get())
     web_database_observer_impl_->WaitForAllDatabasesToClose();
@@ -634,6 +640,12 @@
 }
 
 bool RenderThread::OnControlMessageReceived(const IPC::Message& msg) {
+  for (RenderProcessObserverList::iterator i = observers_.begin();
+       i != observers_.end(); ++i) {
+    if ((*i)->OnControlMessageReceived(msg))
+      return true;
+  }
+
   // Some messages are handled by delegates.
   if (appcache_dispatcher_->OnMessageReceived(msg))
     return true;