[scheduler] Teach scheduler about audio state

content/public/browser/web_contents.h

 // 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.
 
 #ifndef CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 #define CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_
 
 #include <stdint.h>
 
 #include <set>
@@ skipping 379 matching lines @@
   virtual base::TerminationStatus GetCrashedStatus() const = 0;
   virtual int GetCrashedErrorCode() const = 0;
 
   // Whether the tab is in the process of being destroyed.
   virtual bool IsBeingDestroyed() const = 0;
 
   // Convenience method for notifying the delegate of a navigation state
   // change.
   virtual void NotifyNavigationStateChanged(InvalidateTypes changed_flags) = 0;
 
+  // Notifies the WebContents that audio started or stopped being audible.
+  virtual void OnAudioStateChanged(bool is_audio_playing) = 0;

[miu, 2016/11/15 22:04:04]

Throughout this change "playing" is inaccurate. "playing" means samples are
being delivered to the OS sound system. The audio samples may represent silent
or audible sound. So, can you please fix the naming to "audible" everywhere?

[altimin, 2016/11/16 12:22:32]

Addressed in crrev.com/2496173003

+
   // 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;
   virtual void SetLastActiveTime(base::TimeTicks last_active_time) = 0;
 
   // Invoked when the WebContents becomes shown/hidden.
   virtual void WasShown() = 0;
   virtual void WasHidden() = 0;
 
   // Returns true if the before unload and unload listeners need to be
@@ skipping 343 matching lines @@
 
  private:
   // This interface should only be implemented inside content.
   friend class WebContentsImpl;
   WebContents() {}
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_BROWSER_WEB_CONTENTS_H_