Implement PrintPageAsJPEG feature for Print Preview

src/chrome/renderer/mock_render_thread.h

 // Copyright (c) 2009 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 <string>
 #include <vector>
 
@@ skipping 52 matching lines @@
   bool has_widget() const {
     return widget_ ? true : false;
   }
 
   // Simulates the Widget receiving a close message. This should result
   // on releasing the internal reference counts and destroying the internal
   // state.
   void SendCloseMessage();
 
   // Returns the pseudo-printer instance.
-  const MockPrinter* printer() const { return printer_.get(); }
+  MockPrinter* printer() const { return printer_.get(); }
 
  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 activatable,
                          int* route_id);
 
@@ skipping 28 matching lines @@
   IPC::Channel::Listener* widget_;
 
   // The last known good deserializer for sync messages.
   scoped_ptr<IPC::MessageReplyDeserializer> reply_deserializer_;
 
   // A mock printer device used for printing tests.
   scoped_ptr<MockPrinter> printer_;
 };
 
 #endif  // CHROME_RENDERER_MOCK_RENDER_THREAD_H_