Turn webspeech on/off when tab goes fore/background

content/browser/speech/speech_recognition_dispatcher_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_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_
 #define CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "content/common/content_export.h"
@@ skipping 54 matching lines @@
   void OnStartRequest(
       const SpeechRecognitionHostMsg_StartRequest_Params& params);
   void OnStartRequestOnIO(
       int embedder_render_process_id,
       int embedder_render_view_id,
       const SpeechRecognitionHostMsg_StartRequest_Params& params,
       int params_render_frame_id,
       bool filter_profanities);
   void OnAbortRequest(int render_view_id, int request_id);
   void OnStopCaptureRequest(int render_view_id, int request_id);
+  void OnAbortAllRequest(int render_view_id);
 
   int render_process_id_;
   scoped_refptr<net::URLRequestContextGetter> context_getter_;
 
   // Used for posting asynchronous tasks (on the IO thread) without worrying
   // about this class being destroyed in the meanwhile (due to browser shutdown)
   // since tasks pending on a destroyed WeakPtr are automatically discarded.
   base::WeakPtrFactory<SpeechRecognitionDispatcherHost> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SpeechRecognitionDispatcherHost);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_SPEECH_SPEECH_RECOGNITION_DISPATCHER_HOST_H_