Refactor the render widget unittest so it can be reused to create a render vi...

chrome/renderer/render_thread.h

Index: chrome/renderer/render_thread.h
===================================================================
--- chrome/renderer/render_thread.h	(revision 7533)
+++ chrome/renderer/render_thread.h	(working copy)
@@ -20,9 +20,9 @@
 class NotificationService;
 class GreasemonkeySlave;
 
-// The RenderThreadBase is the minimal interface that a RenderWidget expects
-// from a render thread. The interface basically abstracts a way to send and
-// receive messages. It is currently only used for testing.
+// The RenderThreadBase is the minimal interface that a RenderView/Widget
+// expects from a render thread. The interface basically abstracts a way to send
+// and receive messages.
 class RenderThreadBase : public IPC::Message::Sender {
  public:
   virtual ~RenderThreadBase() {}
@@ -34,6 +34,9 @@
   // These methods normally get delegated to a MessageRouter.
   virtual void AddRoute(int32 routing_id, IPC::Channel::Listener* listener) = 0;
   virtual void RemoveRoute(int32 routing_id) = 0;
+
+  virtual void AddFilter(IPC::ChannelProxy::MessageFilter* filter) = 0;
+  virtual void RemoveFilter(IPC::ChannelProxy::MessageFilter* filter) = 0;
 };
 
 // The RenderThread class represents a background thread where RenderView
@@ -59,8 +62,9 @@
   // IPC::Message::Sender implementation:
   virtual bool Send(IPC::Message* msg);
 
-  void AddFilter(IPC::ChannelProxy::MessageFilter* filter);
-  void RemoveFilter(IPC::ChannelProxy::MessageFilter* filter);
+  // Overridded from RenderThreadBase.
+  virtual void AddFilter(IPC::ChannelProxy::MessageFilter* filter);
+  virtual void RemoveFilter(IPC::ChannelProxy::MessageFilter* filter);
 
   // Gets the VisitedLinkSlave instance for this thread
   VisitedLinkSlave* visited_link_slave() const { return visited_link_slave_; }