Associate audio streams with their source/destination RenderView.

content/renderer/media/renderer_webaudiodevice_impl.h

Index: content/renderer/media/renderer_webaudiodevice_impl.h
diff --git a/content/renderer/media/renderer_webaudiodevice_impl.h b/content/renderer/media/renderer_webaudiodevice_impl.h
index 2e747c948ecc375e068519e50f5cc6aad7944299..fb58a2c7c453824a8024ba486d2c3cb6177013c1 100644
--- a/content/renderer/media/renderer_webaudiodevice_impl.h
+++ b/content/renderer/media/renderer_webaudiodevice_impl.h
@@ -6,12 +6,16 @@
 #define CONTENT_RENDERER_MEDIA_MEDIA_RENDERER_WEBAUDIODEVICE_IMPL_H_
 
 #include "base/memory/ref_counted.h"
+#include "base/threading/thread_checker.h"
+#include "media/audio/audio_parameters.h"
 #include "media/base/audio_renderer_sink.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebAudioDevice.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebVector.h"
 
 namespace content {
 
+class RendererAudioOutputDevice;
+
 class RendererWebAudioDeviceImpl
     : public WebKit::WebAudioDevice,
       public media::AudioRendererSink::RenderCallback {
@@ -36,11 +40,17 @@ class RendererWebAudioDeviceImpl
   virtual void OnRenderError() OVERRIDE;
 
  private:
-  scoped_refptr<media::AudioRendererSink> audio_device_;
-  bool is_running_;
+  const media::AudioParameters params_;
 
   // Weak reference to the callback into WebKit code.
-  WebKit::WebAudioDevice::RenderCallback* client_callback_;
+  WebKit::WebAudioDevice::RenderCallback* const client_callback_;
+
+  // To avoid the need for locking, ensure the control methods of the
+  // WebKit::WebAudioDevice implementation are called on the same thread.
+  base::ThreadChecker thread_checker_;
+
+  // When non-NULL, we are started.  When NULL, we are stopped.
+  scoped_refptr<RendererAudioOutputDevice> output_device_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererWebAudioDeviceImpl);
 };