Associate audio streams with their source/destination RenderView.

content/renderer/media/render_audiosourceprovider.cc

Index: content/renderer/media/render_audiosourceprovider.cc
diff --git a/content/renderer/media/render_audiosourceprovider.cc b/content/renderer/media/render_audiosourceprovider.cc
index 750db7fe0a47472c99bbdc50ff3ba7f612062da2..9fdcec705b66567ac5f2d6047747179a8d553ff8 100644
--- a/content/renderer/media/render_audiosourceprovider.cc
+++ b/content/renderer/media/render_audiosourceprovider.cc
@@ -11,6 +11,7 @@
 #include "base/logging.h"
 #include "content/renderer/media/audio_device_factory.h"
 #include "content/renderer/media/audio_renderer_mixer_manager.h"
+#include "content/renderer/media/renderer_audio_output_device.h"
 #include "content/renderer/render_thread_impl.h"
 #include "media/base/audio_renderer_mixer_input.h"
 #include "media/base/media_switches.h"
@@ -21,7 +22,7 @@ using WebKit::WebVector;
 
 namespace content {
 
-RenderAudioSourceProvider::RenderAudioSourceProvider()
+RenderAudioSourceProvider::RenderAudioSourceProvider(int source_render_view_id)
     : is_initialized_(false),
       channels_(0),
       sample_rate_(0),
@@ -44,8 +45,19 @@ RenderAudioSourceProvider::RenderAudioSourceProvider()
   if (use_mixing) {
     default_sink_ = RenderThreadImpl::current()->
         GetAudioRendererMixerManager()->CreateInput();
+    // TODO(miu): Partition mixer instances per RenderView.
   } else {
-    default_sink_ = AudioDeviceFactory::NewOutputDevice();
+    scoped_refptr<RendererAudioOutputDevice> device =
+        AudioDeviceFactory::NewOutputDevice();
+    // The RenderView creating RenderAudioSourceProvider will be the source of
+    // the audio (WebMediaPlayer is always associated with a single frame).
+    //
+    // TODO(miu): Unfortunately, there is one use case where this is not true:
+    // JavaScript code can call new Audio() and pass the object around.  The
+    // RenderAudioSourceProvider is not instantiated until the "src" attribute
+    // has been set.
+    device->SetSourceRenderView(source_render_view_id);
+    default_sink_ = device;
   }
 }