Add audio signal to the ResourceScheduler.

content/browser/renderer_host/render_view_host_impl.cc

Index: content/browser/renderer_host/render_view_host_impl.cc
diff --git a/content/browser/renderer_host/render_view_host_impl.cc b/content/browser/renderer_host/render_view_host_impl.cc
index 6e15855686c45078081e15fff66def1533d51b48..7ffada984c85afa28db1984f531271a649b12630 100644
--- a/content/browser/renderer_host/render_view_host_impl.cc
+++ b/content/browser/renderer_host/render_view_host_impl.cc
@@ -166,7 +166,8 @@ RenderViewHostImpl::RenderViewHostImpl(
     int routing_id,
     int main_frame_routing_id,
     bool swapped_out,
-    bool hidden)
+    bool hidden,
+    bool setup_for_testing)
     : RenderWidgetHostImpl(widget_delegate,
                            instance->GetProcess(),
                            routing_id,
@@ -195,13 +196,22 @@ RenderViewHostImpl::RenderViewHostImpl(
   GetProcess()->EnableSendQueue();
 
   if (ResourceDispatcherHostImpl::Get()) {
+    scoped_refptr<AudioRendererHost> audio_host =

[DaleCurtis, 2014/09/30 17:15:15]

It's a bit convoluted to create an empty refptr simply to get the active audio
state.  Just track a bool:

const AudioRendererHost* arh = *(static_cast<RenderProcessHostImpl*>(
                                     GetProcess())->audio_renderer_host());
const bool has_active_audio =
    setup_for_testing || !arh ? false
                              : arh->RenderViewHasActiveAudio(GetRoutingID());

If |arh| is only NULL during testing (I'm not sure), then you can inline that
into the second clause instead.

+        setup_for_testing ? scoped_refptr<AudioRendererHost>(NULL)
+                          : static_cast<RenderProcessHostImpl*>(GetProcess())
+                                ->audio_renderer_host();
     BrowserThread::PostTask(
-        BrowserThread::IO, FROM_HERE,
+        BrowserThread::IO,
+        FROM_HERE,
         base::Bind(&ResourceDispatcherHostImpl::OnRenderViewHostCreated,
                    base::Unretained(ResourceDispatcherHostImpl::Get()),
-                   GetProcess()->GetID(), GetRoutingID(), !is_hidden()));
+                   GetProcess()->GetID(),
+                   GetRoutingID(),
+                   !is_hidden(),
+                   audio_host.get()
+                       ? audio_host->RenderViewHasActiveAudio(GetRoutingID())
+                       : false));
   }
-
 #if defined(ENABLE_BROWSER_CDMS)
   media_web_contents_observer_.reset(new MediaWebContentsObserver(this));
 #endif