Turn webspeech on/off when tab goes fore/background

content/renderer/speech_recognition_dispatcher.cc

 // 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.
 
 #include "content/renderer/speech_recognition_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/speech_recognition_messages.h"
 #include "content/renderer/render_view_impl.h"
@@ skipping 17 matching lines @@
 SpeechRecognitionDispatcher::SpeechRecognitionDispatcher(
     RenderViewImpl* render_view)
     : RenderViewObserver(render_view),
       recognizer_client_(NULL),
       next_id_(1) {
 }
 
 SpeechRecognitionDispatcher::~SpeechRecognitionDispatcher() {
 }
 
+void SpeechRecognitionDispatcher::AbortAllRecognitions() {
+  for (HandleMap::iterator iter = handle_map_.begin();
+      iter != handle_map_.end();

[no longer working on chromium, 2014/07/24 11:00:29]

fix the indentation

+      ++iter) {
+    // OnEnd event will be sent to the SpeechRecognition object later.
+    abort(iter->second, recognizer_client_);
+  }
+}
+
 bool SpeechRecognitionDispatcher::OnMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP(SpeechRecognitionDispatcher, message)
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_Started, OnRecognitionStarted)
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_AudioStarted, OnAudioStarted)
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_SoundStarted, OnSoundStarted)
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_SoundEnded, OnSoundEnded)
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_AudioEnded, OnAudioEnded)
     IPC_MESSAGE_HANDLER(SpeechRecognitionMsg_ErrorOccurred, OnErrorOccurred)
@@ skipping 187 matching lines @@
 }
 
 const WebSpeechRecognitionHandle& SpeechRecognitionDispatcher::GetHandleFromID(
     int request_id) {
   HandleMap::iterator iter = handle_map_.find(request_id);
   DCHECK(iter != handle_map_.end());
   return iter->second;
 }
 
 }  // namespace content