Add BlimpDocument, pull out functions in BlimpCompositor.

blimp/client/core/render_widget/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_CORE_RENDER_WIDGET_RENDER_WIDGET_FEATURE_H_
 #define BLIMP_CLIENT_CORE_RENDER_WIDGET_RENDER_WIDGET_FEATURE_H_
 
 #include <stdint.h>
 
 #include <map>
@@ skipping 55 matching lines @@
   // messages to the engine.
   void set_outgoing_input_message_processor(
       std::unique_ptr<BlimpMessageProcessor> processor);
 
   // Set the BlimpMessageProcessor that will be used to send
   // BlimpMessage::COMPOSITOR messages to the engine.
   void set_outgoing_compositor_message_processor(
       std::unique_ptr<BlimpMessageProcessor> processor);
 
   // Sends a WebGestureEvent for |tab_id| to the engine.
-  void SendWebGestureEvent(const int tab_id,
-                           const int render_widget_id,
-                           const blink::WebGestureEvent& event);
+  // virtual for testing.
+  virtual void SendWebGestureEvent(const int tab_id,
+                                   const int render_widget_id,
+                                   const blink::WebGestureEvent& event);
 
   // Sends a CompositorMessage for |tab_id| to the engine.
-  void SendCompositorMessage(const int tab_id,
-                             const int render_widget_id,
-                             const cc::proto::CompositorMessage& message);
+  // virtual for testing.
+  virtual void SendCompositorMessage(
+      const int tab_id,
+      const int render_widget_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.
   // virtual for testing.
   virtual void SetDelegate(int tab_id, RenderWidgetFeatureDelegate* delegate);
   virtual void RemoveDelegate(const int tab_id);
 
   // BlimpMessageProcessor implementation.
   void ProcessMessage(std::unique_ptr<BlimpMessage> message,
@@ skipping 22 matching lines @@
   // Used to send BlimpMessage::COMPOSITOR messages to the engine.
   std::unique_ptr<BlimpMessageProcessor> outgoing_compositor_message_processor_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidgetFeature);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_CORE_RENDER_WIDGET_RENDER_WIDGET_FEATURE_H_