Making WebRtcAudioRenderer sink to always play after start.

content/renderer/media/webrtc_audio_renderer.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 "content/renderer/media/webrtc_audio_renderer.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 368 matching lines @@
   sink_->Stop();
   sink_ = new_sink;
   output_device_id_ = device_id;
   security_origin_ = security_origin;
   {
     base::AutoLock auto_lock(lock_);
     source_->AudioRendererThreadStopped();
   }
   PrepareSink();
   sink_->Start();
+  sink_->Play();  // Not all the sinks play on start.
 
   callback.Run(media::OUTPUT_DEVICE_STATUS_OK);
 }
 
 int WebRtcAudioRenderer::Render(media::AudioBus* audio_bus,
                                 uint32_t frames_delayed,
                                 uint32_t frames_skipped) {
   DCHECK(sink_->CurrentThreadIsRenderingThread());
   base::AutoLock auto_lock(lock_);
   if (!source_)
@@ skipping 248 matching lines @@
           base::Bind(&WebRtcAudioRenderer::SourceCallback,
                      base::Unretained(this))));
     }
     sink_params_ = new_sink_params;
   }
 
   sink_->Initialize(new_sink_params, this);
 }
 
 }  // namespace content