Turn webspeech on/off when tab goes fore/background

content/browser/speech/speech_recognition_dispatcher_host.cc

Index: content/browser/speech/speech_recognition_dispatcher_host.cc
diff --git a/content/browser/speech/speech_recognition_dispatcher_host.cc b/content/browser/speech/speech_recognition_dispatcher_host.cc
index f18ad7ddfe24bea1b9c43e9b4b09b305e65e0472..856054b77246e315282f49fef36db3a1aab41adb 100644
--- a/content/browser/speech/speech_recognition_dispatcher_host.cc
+++ b/content/browser/speech/speech_recognition_dispatcher_host.cc
@@ -52,6 +52,8 @@ bool SpeechRecognitionDispatcherHost::OnMessageReceived(
                         OnAbortRequest)
     IPC_MESSAGE_HANDLER(SpeechRecognitionHostMsg_StopCaptureRequest,
                         OnStopCaptureRequest)
+    IPC_MESSAGE_HANDLER(SpeechRecognitionHostMsg_AbortAllRequest,
+                        OnAbortAllRequest)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;
@@ -173,6 +175,11 @@ void SpeechRecognitionDispatcherHost::OnAbortRequest(int render_view_id,
     SpeechRecognitionManager::GetInstance()->AbortSession(session_id);
 }
 
+void SpeechRecognitionDispatcherHost::OnAbortAllRequest(int render_view_id) {
+  SpeechRecognitionManager::GetInstance()->AbortAllSessionsForRenderView(
+      render_process_id_, render_view_id);
+}
+
 void SpeechRecognitionDispatcherHost::OnStopCaptureRequest(
     int render_view_id, int request_id) {
   int session_id = SpeechRecognitionManager::GetInstance()->GetSession(