Part 1: Plumb render view ID to render host

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 d450d9d5c893ae6485edfa37f4fb97ef9c54c4b3..a30bb40fb82b4d2a8cadd2ef6dada8cb2218feff 100644
--- a/content/renderer/media/render_audiosourceprovider.cc
+++ b/content/renderer/media/render_audiosourceprovider.cc
@@ -19,7 +19,7 @@ using content::AudioRendererMixerManager;
 using std::vector;
 using WebKit::WebVector;
 
-RenderAudioSourceProvider::RenderAudioSourceProvider()
+RenderAudioSourceProvider::RenderAudioSourceProvider(int render_view_id)
     : is_initialized_(false),
       channels_(0),
       sample_rate_(0),
@@ -33,9 +33,9 @@ RenderAudioSourceProvider::RenderAudioSourceProvider()
   const CommandLine* cmd_line = CommandLine::ForCurrentProcess();
   if (cmd_line->HasSwitch(switches::kEnableRendererSideMixing)) {
     default_sink_ = RenderThreadImpl::current()->
-        GetAudioRendererMixerManager()->CreateInput();
+        GetAudioRendererMixerManager()->CreateInput(render_view_id);
   } else {
-    default_sink_ = AudioDeviceFactory::NewOutputDevice();
+    default_sink_ = AudioDeviceFactory::NewOutputDevice(render_view_id);
   }
 }