Part 1: Plumb render view ID to render host

content/renderer/media/audio_device_factory.cc

Index: content/renderer/media/audio_device_factory.cc
diff --git a/content/renderer/media/audio_device_factory.cc b/content/renderer/media/audio_device_factory.cc
index ad7968884e78c410b8e03094850e03da0efb7318..32ec5cae554b98a2d56a5a3a3a21263cf02ab027 100644
--- a/content/renderer/media/audio_device_factory.cc
+++ b/content/renderer/media/audio_device_factory.cc
@@ -6,6 +6,7 @@
 
 #include "base/logging.h"
 #include "content/common/child_process.h"
+#include "content/renderer/media/audio_output_ipc.h"
 #include "content/renderer/media/audio_input_message_filter.h"
 #include "content/renderer/media/audio_message_filter.h"
 #include "media/audio/audio_input_device.h"
@@ -17,13 +18,14 @@ namespace content {
 AudioDeviceFactory* AudioDeviceFactory::factory_ = NULL;
 
 // static
-media::AudioRendererSink* AudioDeviceFactory::NewOutputDevice() {
+media::AudioRendererSink* AudioDeviceFactory::NewOutputDevice(
+    int render_view_id) {
   media::AudioRendererSink* device = NULL;
   if (factory_)
     device = factory_->CreateOutputDevice();
 
   return device ? device : new media::AudioOutputDevice(
-      AudioMessageFilter::Get(),
+      new AudioOutputIPC(render_view_id),
       ChildProcess::current()->io_message_loop()->message_loop_proxy());
 }