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diff --git a/chrome/renderer/mock_render_thread.h b/chrome/renderer/mock_render_thread.h
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+// Copyright (c) 2008 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef CHROME_RENDERER_MOCK_RENDER_THREAD_H_
+#define CHROME_RENDERER_MOCK_RENDER_THREAD_H_
+
+#include <vector>
+
+#include "chrome/renderer/render_thread.h"
+
+// This class is very simple mock of RenderThread. It simulates an IPC channel
+// which supports only two messages:
+// ViewHostMsg_CreateWidget : sync message sent by the Widget.
+// ViewMsg_Close : async, send to the Widget.
+class MockRenderThread : public RenderThreadBase {
+ public:
+  // Encapusulates an IPC message and its associated data (which is not
+  // otherwise bound to the lifetime of the message).
+  typedef std::pair<IPC::Message, char*> MessagePair;
+
+  MockRenderThread();
+  virtual ~MockRenderThread();
+
+  // Called by the Widget. Not used in the test.
+  virtual bool InSend() const {
+    return false;
+  }
+
+  // Called by the Widget. The routing_id must match the routing id assigned
+  // to the Widget in reply to ViewHostMsg_CreateWidget message.
+  virtual void AddRoute(int32 routing_id, IPC::Channel::Listener* listener);
+
+  // Called by the Widget. The routing id must match the routing id of AddRoute.
+  virtual void RemoveRoute(int32 routing_id);
+
+  // Called by the Widget. Used to send messages to the browser.
+  // We short-circuit the mechanim and handle the messages right here on this
+  // class.
+  virtual bool Send(IPC::Message* msg);
+
+  // Our mock thread doesn't do filtering.
+  virtual void AddFilter(IPC::ChannelProxy::MessageFilter* filter) {
+  }
+  virtual void RemoveFilter(IPC::ChannelProxy::MessageFilter* filter) {
+  }
+
+  //////////////////////////////////////////////////////////////////////////
+  // The following functions are called by the test itself.
+
+  void set_routing_id(int32 id) {
+    routing_id_ = id;
+  }
+
+  int32 opener_id() const {
+    return opener_id_;
+  }
+
+  bool has_widget() const {
+    return widget_ ? true : false;
+  }
+
+  // Returns the number of messages in the queue.
+  size_t message_count() const { return messages_.size(); }
+
+  // Clears the message queue of saved messages.
+  void ClearMessages();
+
+  // Returns the message at the given index in the queue. The index may be out
+  // of range, in which case the return value is NULL. The returned pointer will
+  // only be valid until another message is received or the list is cleared.
+  const IPC::Message* GetMessageAt(size_t index) const;
+
+  // Returns the first message with the given ID in the queue. If there is no
+  // message with the given ID, returns NULL. The returned pointer will only be
+  // valid until another message is received or the list is cleared.
+  const IPC::Message* GetFirstMessageMatching(uint16 id) const;
+
+  // Returns the message with the given ID in the queue. If there is no such
+  // message or there is more than one of that message, this will return NULL
+  // (with the expectation that you'll do an ASSERT_TRUE() on the result).
+  // The returned pointer will only be valid until another message is received
+  // or the list is cleared.
+  const IPC::Message* GetUniqueMessageMatching(uint16 id) const;
+
+  // Simulates the Widget receiving a close message. This should result
+  // on releasing the internal reference counts and destroying the internal
+  // state.
+  void SendCloseMessage();
+
+ private:
+  // This function operates as a regular IPC listener.
+  void OnMessageReceived(const IPC::Message& msg);
+
+  // The Widget expects to be returned valid route_id.
+  void OnMsgCreateWidget(int opener_id,
+                         bool focus_on_show,
+                         int* route_id);
+
+  // Routing id what will be assigned to the Widget.
+  int32 routing_id_;
+
+  // Opener id reported by the Widget.
+  int32 opener_id_;
+
+  // We only keep track of one Widget, we learn its pointer when it
+  // adds a new route.
+  IPC::Channel::Listener* widget_;
+
+  // The last known good deserializer for sync messages.
+  IPC::MessageReplyDeserializer* reply_deserializer_;
+
+  std::vector<MessagePair> messages_;
+};
+
+#endif  // CHROME_RENDERER_MOCK_RENDER_THREAD_H_