Strip out stream counting from AudioRendererHost.

content/browser/renderer_host/render_process_host_impl.cc

Index: content/browser/renderer_host/render_process_host_impl.cc
diff --git a/content/browser/renderer_host/render_process_host_impl.cc b/content/browser/renderer_host/render_process_host_impl.cc
index 79eeee2ffcf4a1e6665a8871fc4bfd83e2e16baa..dbe2482c8e4d5b9322112188975b25974b32ba6d 100644
--- a/content/browser/renderer_host/render_process_host_impl.cc
+++ b/content/browser/renderer_host/render_process_host_impl.cc
@@ -1572,7 +1572,13 @@ int RenderProcessHostImpl::VisibleWidgetCount() const {
   return visible_widgets_;
 }
 
-void RenderProcessHostImpl::AudioStateChanged() {
+void RenderProcessHostImpl::OnAudioStreamAdded() {
+  ++audio_stream_count_;
+  UpdateProcessPriority();
+}
+
+void RenderProcessHostImpl::OnAudioStreamRemoved() {
+  --audio_stream_count_;

[o1ka, 2017/02/07 09:38:02]

DCHECK(audio_stream_count_ > 0)?

[DaleCurtis, 2017/02/07 22:09:16]

Done.

   UpdateProcessPriority();
 }
 
@@ -2831,7 +2837,7 @@ void RenderProcessHostImpl::UpdateProcessPriority() {
   // visible widgets -- the callers must call this function whenever we
   // transition in/out of those states.
   const bool should_background =
-      visible_widgets_ == 0 && !audio_renderer_host_->HasActiveAudio() &&
+      visible_widgets_ == 0 && audio_stream_count_ == 0 &&
       !base::CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kDisableRendererBackgrounding);