Plumb render view ID from audio-related code in renderer through IPCs to AudioRendererHost in brows…

content/renderer/pepper/pepper_platform_audio_output_impl.cc

Index: content/renderer/pepper/pepper_platform_audio_output_impl.cc
diff --git a/content/renderer/pepper/pepper_platform_audio_output_impl.cc b/content/renderer/pepper/pepper_platform_audio_output_impl.cc
index d196102106fd355a9391cc4c606caff21697c479..01b66d64e0bd6baabb409587ff9868044bb9b300 100644
--- a/content/renderer/pepper/pepper_platform_audio_output_impl.cc
+++ b/content/renderer/pepper/pepper_platform_audio_output_impl.cc
@@ -20,11 +20,12 @@ namespace content {
 
 // static
 PepperPlatformAudioOutputImpl* PepperPlatformAudioOutputImpl::Create(
+    int render_view_id,
     int sample_rate,
     int frames_per_buffer,
     webkit::ppapi::PluginDelegate::PlatformAudioOutputClient* client) {
   scoped_refptr<PepperPlatformAudioOutputImpl> audio_output(
-      new PepperPlatformAudioOutputImpl());
+      new PepperPlatformAudioOutputImpl(render_view_id));
   if (audio_output->Initialize(sample_rate, frames_per_buffer, client)) {
     // Balanced by Release invoked in
     // PepperPlatformAudioOutputImpl::ShutDownOnIOThread().
@@ -94,7 +95,7 @@ void PepperPlatformAudioOutputImpl::OnStreamCreated(
 }
 
 void PepperPlatformAudioOutputImpl::OnIPCClosed() {
-  ipc_ = NULL;
+  ipc_.reset();
 }
 
 PepperPlatformAudioOutputImpl::~PepperPlatformAudioOutputImpl() {
@@ -104,11 +105,12 @@ PepperPlatformAudioOutputImpl::~PepperPlatformAudioOutputImpl() {
   DCHECK(!client_);
 }
 
-PepperPlatformAudioOutputImpl::PepperPlatformAudioOutputImpl()
+PepperPlatformAudioOutputImpl::PepperPlatformAudioOutputImpl(int render_view_id)
     : client_(NULL),
       stream_id_(0),
       main_message_loop_proxy_(base::MessageLoopProxy::current()) {
-  ipc_ = RenderThreadImpl::current()->audio_message_filter();
+  ipc_.reset(RenderThreadImpl::current()->audio_message_filter()->
+                 CreateAudioOutputIPC(render_view_id));
 }
 
 bool PepperPlatformAudioOutputImpl::Initialize(