Add TabControlFeature to BlimpClientContextImpl

blimp/client/core/contents/tab_control_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_CONTENTS_TAB_CONTROL_FEATURE_H_
 #define BLIMP_CLIENT_CORE_CONTENTS_TAB_CONTROL_FEATURE_H_
 
 #include <memory>
 
 #include "base/macros.h"
@@ skipping 12 matching lines @@
   TabControlFeature();
   ~TabControlFeature() override;
 
   // Set the BlimpMessageProcessor that will be used to send
   // BlimpMessage::TAB_CONTROL messages to the engine.
   void set_outgoing_message_processor(
       std::unique_ptr<BlimpMessageProcessor> processor);
 
   // Pushes the current size and scale information to the engine, which will
   // affect the web content display area for all tabs.
-  void SetSizeAndScale(const gfx::Size& size, float device_pixel_ratio);
+  virtual void SetSizeAndScale(const gfx::Size& size, float device_pixel_ratio);
 
-  void CreateTab(int tab_id);
-  void CloseTab(int tab_id);
+  virtual void CreateTab(int tab_id);
+  virtual void CloseTab(int tab_id);
 
   // BlimpMessageProcessor implementation.
   void ProcessMessage(std::unique_ptr<BlimpMessage> message,
                       const net::CompletionCallback& callback) override;
 
  private:
   // Used to send BlimpMessage::TAB_CONTROL messages to the engine.
   std::unique_ptr<BlimpMessageProcessor> outgoing_message_processor_;
 
   // Used to avoid sending unnecessary messages to engine.
   gfx::Size last_size_;
   float last_device_pixel_ratio_ = -1;
 
   DISALLOW_COPY_AND_ASSIGN(TabControlFeature);
 };
 
 }  // namespace client
 }  // namespace blimp
 
 #endif  // BLIMP_CLIENT_CORE_CONTENTS_TAB_CONTROL_FEATURE_H_