blimp: Use remote client LayerTreeHost in the BlimpCompositor.

blimp/client/feature/render_widget_feature.h

 // Copyright 2015 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 BLIMP_CLIENT_FEATURE_RENDER_WIDGET_FEATURE_H_
 #define BLIMP_CLIENT_FEATURE_RENDER_WIDGET_FEATURE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 56 matching lines @@
   // Sends a WebInputEvent for |tab_id| to the engine.
   void SendInputEvent(const int tab_id, const blink::WebInputEvent& event);
 
   // Sends a CompositorMessage for |tab_id| to the engine.
   void SendCompositorMessage(const int tab_id,
                              const cc::proto::CompositorMessage& message);
 
   // Sets a RenderWidgetMessageDelegate to be notified of all incoming
   // RenderWidget related messages for |tab_id| from the engine.  There can only
   // be one RenderWidgetMessageDelegate per tab.
-  void SetDelegate(const int tab_id, RenderWidgetFeatureDelegate* delegate);
-  void RemoveDelegate(const int tab_id);
+  // virtual for testing.
+  virtual void SetDelegate(int tab_id, RenderWidgetFeatureDelegate* delegate);
+  virtual void RemoveDelegate(const int tab_id);
 
  private:
   // BlimpMessageProcessor implementation.
   void ProcessMessage(scoped_ptr<BlimpMessage> message,
                       const net::CompletionCallback& callback) override;
 
   // Returns nullptr if no delegate is found.
   RenderWidgetFeatureDelegate* FindDelegate(const int tab_id);
 
   // Returns 0 if no id is found.
@@ skipping 14 matching lines @@
   // Used to send BlimpMessage::COMPOSITOR messages to the engine.
   scoped_ptr<BlimpMessageProcessor> outgoing_compositor_message_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetFeature);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_FEATURE_RENDER_WIDGET_FEATURE_H_