Add mojo interface+impl for audio stream control.

content/browser/renderer_host/media/audio_output_delegate_impl_unittest.cc

 // Copyright 2016 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 "content/browser/renderer_host/media/audio_output_delegate_impl.h"
 
 #include <stdint.h>
 
 #include <memory>
 #include <utility>
@@ skipping 58 matching lines @@
   void OnSetCapturingLinkSecured(int render_process_id,
                                  int render_frame_id,
                                  int page_request_id,
                                  MediaStreamType stream_type,
                                  bool is_secure) override {}
 
   MOCK_METHOD2(OnCreatingAudioStream,
                void(int render_process_id, int render_frame_id));
 };
 
-class MockEventHandler : public AudioOutputDelegate::EventHandler {
+class MockEventHandler : public media::AudioOutputDelegate::EventHandler {
  public:
   MOCK_METHOD3(OnStreamCreated,
                void(int stream_id,
                     base::SharedMemory* shared_memory,
                     base::CancelableSyncSocket* socket));
   MOCK_METHOD1(OnStreamError, void(int stream_id));
 };
 
 class DummyAudioOutputStream : public media::AudioOutputStream {
  public:
@@ skipping 480 matching lines @@
 TEST_F(AudioOutputDelegateTest, ErrorAndDestroy) {
   base::RunLoop l;
   BrowserThread::PostTask(
       BrowserThread::IO, FROM_HERE,
       base::Bind(&AudioOutputDelegateTest::PlayAndDestroyTest,
                  base::Unretained(this), l.QuitClosure()));
   l.Run();
 }
 
 }  // namespace content