Turn webspeech on/off when tab goes fore/background

content/renderer/speech_recognition_dispatcher.cc

Index: content/renderer/speech_recognition_dispatcher.cc
diff --git a/content/renderer/speech_recognition_dispatcher.cc b/content/renderer/speech_recognition_dispatcher.cc
index 3d76c20b90825a495e7da382468866f87e26a8b4..06cef4c360d43cf44162d245b3ae9640087cf98b 100644
--- a/content/renderer/speech_recognition_dispatcher.cc
+++ b/content/renderer/speech_recognition_dispatcher.cc
@@ -35,6 +35,15 @@ SpeechRecognitionDispatcher::SpeechRecognitionDispatcher(
 SpeechRecognitionDispatcher::~SpeechRecognitionDispatcher() {
 }
 
+void SpeechRecognitionDispatcher::AbortAllRecognitions() {
+  for (HandleMap::iterator iter = handle_map_.begin();
+      iter != handle_map_.end();
+      ++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;
@@ -58,6 +67,7 @@ void SpeechRecognitionDispatcher::start(
     const WebSpeechRecognitionParams& params,
     WebSpeechRecognizerClient* recognizer_client) {
   DCHECK(!recognizer_client_ || recognizer_client_ == recognizer_client);
+
   recognizer_client_ = recognizer_client;
 
   SpeechRecognitionHostMsg_StartRequest_Params msg_params;
@@ -206,7 +216,6 @@ void SpeechRecognitionDispatcher::OnResultsRetrieved(
       GetHandleFromID(request_id), final, provisional);
 }
 
-
 int SpeechRecognitionDispatcher::GetOrCreateIDForHandle(
     const WebSpeechRecognitionHandle& handle) {
   // Search first for an existing mapping.