Fix idle handlers not being called. The problem was that RenderThread::AddRoute was assuming that e…

content/renderer/render_thread_impl.h

Index: content/renderer/render_thread_impl.h
===================================================================
--- content/renderer/render_thread_impl.h	(revision 244175)
+++ content/renderer/render_thread_impl.h	(working copy)
@@ -132,8 +132,6 @@
   virtual void RemoveObserver(RenderProcessObserver* observer) OVERRIDE;
   virtual void SetResourceDispatcherDelegate(
       ResourceDispatcherDelegate* delegate) OVERRIDE;
-  virtual void WidgetHidden() OVERRIDE;
-  virtual void WidgetRestored() OVERRIDE;
   virtual void EnsureWebKitInitialized() OVERRIDE;
   virtual void RecordAction(const UserMetricsAction& action) OVERRIDE;
   virtual void RecordComputedAction(const std::string& action) OVERRIDE;
@@ -345,6 +343,13 @@
   // this would be available on all platforms via base::Process.
   base::ProcessId renderer_process_id() const;
 
+  // Called by a RenderWidget when it is created or destroyed. This
+  // allows the process to know when there are no visible widgets.
+  void WidgetCreated();
+  void WidgetDestroyed();
+  void WidgetHidden();
+  void WidgetRestored();
+
  private:
   // ChildThread
   virtual bool OnControlMessageReceived(const IPC::Message& msg) OVERRIDE;