Add support for switching the audio output device for HTMLMediaElements.

media/audio/audio_output_device_unittest.cc

 // Copyright (c) 2012 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.
 
 #include <vector>
 
 #include "base/at_exit.h"
 #include "base/memory/shared_memory.h"
 #include "base/message_loop/message_loop.h"
 #include "base/process/process_handle.h"
@@ skipping 34 matching lines @@
   MockAudioOutputIPC() {}
   virtual ~MockAudioOutputIPC() {}
 
   MOCK_METHOD3(CreateStream, void(AudioOutputIPCDelegate* delegate,
                                   const AudioParameters& params,
                                   int session_id));
   MOCK_METHOD0(PlayStream, void());
   MOCK_METHOD0(PauseStream, void());
   MOCK_METHOD0(CloseStream, void());
   MOCK_METHOD1(SetVolume, void(double volume));
+  MOCK_METHOD4(SwitchDevice,
+               void(const std::string& device_id,
+                    const GURL& security_origin,
+                    int request_id,
+                    const base::Callback<void(int)>& callback));
 };
 
 ACTION_P2(SendPendingBytes, socket, pending_bytes) {
   socket->Send(&pending_bytes, sizeof(pending_bytes));
 }
 
 // Used to terminate a loop from a different thread than the loop belongs to.
 // |loop| should be a MessageLoopProxy.
 ACTION_P(QuitLoop, loop) {
   loop->PostTask(FROM_HERE, base::MessageLoop::QuitClosure());
@@ skipping 166 matching lines @@
 }
 
 // Full test with output only.
 TEST_P(AudioOutputDeviceTest, CreateStream) {
   StartAudioDevice();
   ExpectRenderCallback();
   CreateStream();
   WaitUntilRenderCallback();
   StopAudioDevice();
 }
 

[miu, 2015/06/03 21:01:01]

Please write one or more unit tests to test new functionality.

 INSTANTIATE_TEST_CASE_P(Render, AudioOutputDeviceTest, Values(false));
 
 }  // namespace media.