[scheduler] Teach scheduler about audio state

content/child/child_thread_impl.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_CHILD_CHILD_THREAD_IMPL_H_
 #define CONTENT_CHILD_CHILD_THREAD_IMPL_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
@@ skipping 199 matching lines @@
   // Called when the process refcount is 0.
   void OnProcessFinalRelease();
 
   // Called by subclasses to manually start the MojoShellConnection. Must only
   // be called if ChildThreadImpl::Options::auto_start_mojo_shell_connection
   // was set to |false| on ChildThreadImpl construction.
   void StartMojoShellConnection();
 
   virtual bool OnControlMessageReceived(const IPC::Message& msg);
   virtual void OnProcessBackgrounded(bool backgrounded);
+  virtual void OnAudioStateChanged(bool has_audio_playing);
   virtual void OnProcessPurgeAndSuspend();
 
   // IPC::Listener implementation:
   bool OnMessageReceived(const IPC::Message& msg) override;
   void OnChannelConnected(int32_t peer_pid) override;
   void OnChannelError() override;
 
   bool IsInBrowserProcess() const;
   scoped_refptr<base::SequencedTaskRunner> GetIOTaskRunner();
 
@@ skipping 140 matching lines @@
 
  private:
   struct Options options_;
 
   DISALLOW_COPY_AND_ASSIGN(Builder);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_CHILD_CHILD_THREAD_IMPL_H_