Add audio signal to the ResourceScheduler.

content/browser/renderer_host/render_view_host_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/renderer_host/render_view_host_impl.h"
 
 #include <set>
 #include <string>
 #include <utility>
 #include <vector>
@@ skipping 148 matching lines @@
   return static_cast<RenderViewHostImpl*>(RenderWidgetHostImpl::From(widget));
 }
 
 RenderViewHostImpl::RenderViewHostImpl(
     SiteInstance* instance,
     RenderViewHostDelegate* delegate,
     RenderWidgetHostDelegate* widget_delegate,
     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,
                            hidden),
       frames_ref_count_(0),
       delegate_(delegate),
       instance_(static_cast<SiteInstanceImpl*>(instance)),
       waiting_for_drag_context_response_(false),
       enabled_bindings_(0),
       page_id_(-1),
       is_active_(!swapped_out),
       is_swapped_out_(swapped_out),
       main_frame_routing_id_(main_frame_routing_id),
       run_modal_reply_msg_(NULL),
       run_modal_opener_id_(MSG_ROUTING_NONE),
       is_waiting_for_close_ack_(false),
       sudden_termination_allowed_(false),
       render_view_termination_status_(base::TERMINATION_STATUS_STILL_RUNNING),
       virtual_keyboard_requested_(false),
       is_focused_element_editable_(false),
       updating_web_preferences_(false),
       weak_factory_(this) {
   DCHECK(instance_.get());
   CHECK(delegate_);  // http://crbug.com/82827
 
   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
 }
 
 RenderViewHostImpl::~RenderViewHostImpl() {
   if (ResourceDispatcherHostImpl::Get()) {
     BrowserThread::PostTask(
         BrowserThread::IO, FROM_HERE,
         base::Bind(&ResourceDispatcherHostImpl::OnRenderViewHostDeleted,
@@ skipping 1177 matching lines @@
   FrameTree* frame_tree = delegate_->GetFrameTree();
 
   frame_tree->ResetForMainFrameSwap();
 }
 
 void RenderViewHostImpl::SelectWordAroundCaret() {
   Send(new ViewMsg_SelectWordAroundCaret(GetRoutingID()));
 }
 
 }  // namespace content