Add audio signal to the ResourceScheduler.

content/browser/renderer_host/render_view_host_impl.h

Index: content/browser/renderer_host/render_view_host_impl.h
diff --git a/content/browser/renderer_host/render_view_host_impl.h b/content/browser/renderer_host/render_view_host_impl.h
index 2499c64bcea9d4597502c463c17b4c60839a2466..575bdf873da9f4ede2a22ea3923983e91fd89c8d 100644
--- a/content/browser/renderer_host/render_view_host_impl.h
+++ b/content/browser/renderer_host/render_view_host_impl.h
@@ -102,14 +102,14 @@ class CONTENT_EXPORT RenderViewHostImpl
   // spec) space. This is useful when restoring contentses, but most callers
   // should pass in NULL which will cause a new SessionStorageNamespace to be
   // created.
-  RenderViewHostImpl(
-      SiteInstance* instance,
-      RenderViewHostDelegate* delegate,
-      RenderWidgetHostDelegate* widget_delegate,
-      int routing_id,
-      int main_frame_routing_id,
-      bool swapped_out,
-      bool hidden);
+  RenderViewHostImpl(SiteInstance* instance,
+                     RenderViewHostDelegate* delegate,
+                     RenderWidgetHostDelegate* widget_delegate,
+                     int routing_id,
+                     int main_frame_routing_id,
+                     bool swapped_out,
+                     bool hidden,
+                     bool setup_for_testing);

[jam, 2014/10/01 00:12:36]

nit: can we just call this create_audio_renderer_host and flip its meaning?
setup_for_testing is vague

   virtual ~RenderViewHostImpl();
 
   // RenderViewHost implementation.