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..a13073ffe7b99827e48fc034dd9807c937f1693b 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 has_render_process_host_impl)
     : RenderWidgetHostImpl(widget_delegate,
                            instance->GetProcess(),
                            routing_id,
@@ -195,13 +196,24 @@ RenderViewHostImpl::RenderViewHostImpl(
   GetProcess()->EnableSendQueue();
 
   if (ResourceDispatcherHostImpl::Get()) {
+    bool has_active_audio = false;
+    if (has_render_process_host_impl) {
+      scoped_refptr<AudioRendererHost> arh =
+          static_cast<RenderProcessHostImpl*>(GetProcess())
+              ->audio_renderer_host();
+      if (arh.get())
+        has_active_audio = arh->RenderViewHasActiveAudio(GetRoutingID());
+    }
     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(),
+                   has_active_audio));
   }

[jam, 2014/10/01 20:31:38]

actually, now that I look at this some more. how about we move all this code in
the constructor to the Init method? the coding style does say to avoid doing
work in the constructor.

then if the Init method isn't called by the unittest, we're good to go?

-
 #if defined(ENABLE_BROWSER_CDMS)
   media_web_contents_observer_.reset(new MediaWebContentsObserver(this));
 #endif