Fixed the audio backgrounding bug

content/public/browser/render_process_host.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_RENDER_PROCESS_HOST_H_
 #define CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_
 
 #include <list>
 
 #include "base/basictypes.h"
@@ skipping 81 matching lines @@
   // bad_message::BadMessageReceived() or an equivalent method outside of the
   // content module.
   virtual void ShutdownForBadMessage() = 0;
 
   // Track the count of visible widgets. Called by listeners to register and
   // unregister visibility.
   virtual void WidgetRestored() = 0;
   virtual void WidgetHidden() = 0;
   virtual int VisibleWidgetCount() const = 0;
 
+  // Called when the audio state changes for this render process host.
+  virtual void AudioStateChanged() = 0;
+
   // Indicates whether the current RenderProcessHost is exclusively hosting
   // guest RenderFrames. Not all guest RenderFrames are created equal.  A guest,
   // as indicated by BrowserPluginGuest::IsGuest, may coexist with other
   // non-guest RenderFrames in the same process if IsForGuestsOnly() is false.
   virtual bool IsForGuestsOnly() const = 0;
 
   // Returns the storage partition associated with this process.
   //
   // TODO(nasko): Remove this function from the public API once
   // URLRequestContextGetter's creation is moved into StoragePartition.
@@ skipping 163 matching lines @@
   // Returns the ::media::BrowserCdm instance associated with |render_frame_id|
   // and |cdm_id|, or nullptr if not found.
   virtual media::BrowserCdm* GetBrowserCdm(int render_frame_id,
                                            int cdm_id) const = 0;
 #endif
 
   // Returns the current number of active views in this process.  Excludes
   // any RenderViewHosts that are swapped out.
   int GetActiveViewCount();
 
+#if defined(OS_MACOSX)
+  // Returns the mach port associated with the process. Use only for testing.
+  virtual mach_port_t GetMachTaskPortForTesting() const = 0;
+#endif
+
   // Static management functions -----------------------------------------------
 
   // Flag to run the renderer in process.  This is primarily
   // for debugging purposes.  When running "in process", the
   // browser maintains a single RenderProcessHost which communicates
   // to a RenderProcess which is instantiated in the same process
   // with the Browser.  All IPC between the Browser and the
   // Renderer is the same, it's just not crossing a process boundary.
 
   static bool run_renderer_in_process();
@@ skipping 38 matching lines @@
   static void SetMaxRendererProcessCount(size_t count);
 
   // Returns the current maximum number of renderer process hosts kept by the
   // content module.
   static size_t GetMaxRendererProcessCount();
 };
 
 }  // namespace content.
 
 #endif  // CONTENT_PUBLIC_BROWSER_RENDER_PROCESS_HOST_H_