[scheduler] Teach scheduler about audio state

content/public/browser/web_contents.h

Index: content/public/browser/web_contents.h
diff --git a/content/public/browser/web_contents.h b/content/public/browser/web_contents.h
index 1eb4d7c0c60b656b6b1918b8f7ae61be99089e69..168ad8d0d6166046adc668946041f4be3fecc378 100644
--- a/content/public/browser/web_contents.h
+++ b/content/public/browser/web_contents.h
@@ -259,6 +259,10 @@ class WebContents : public PageNavigator,
   // number of sent messages (i.e. the number of processed frames).
   virtual int SendToAllFrames(IPC::Message* message) = 0;
 
+  // Sends the given IPC to all live WebViews (can be more than one due to
+  // out-of-process iframes) and returns the number of sent messages.
+  virtual int SendToAllViews(IPC::Message* message) = 0;
+
   // Gets the current RenderViewHost for this tab.
   virtual RenderViewHost* GetRenderViewHost() const = 0;
 
@@ -407,6 +411,10 @@ class WebContents : public PageNavigator,
   // change.
   virtual void NotifyNavigationStateChanged(InvalidateTypes changed_flags) = 0;
 
+  // Method for notifying WebContents that audio started or stopped being
+  // audible.
+  virtual void OnAudioStateChanged(bool is_audio_playing) = 0;
+
   // Get/Set the last time that the WebContents was made active (either when it
   // was created or shown with WasShown()).
   virtual base::TimeTicks GetLastActiveTime() const = 0;