Turn webspeech on/off when tab goes fore/background

content/renderer/render_view_impl.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/render_view_impl.h"
 
 #include <algorithm>
 #include <cmath>
 
 #include "base/auto_reset.h"
@@ skipping 3240 matching lines @@
     return false;
   return webview()->hasTouchEventHandlersAt(point);
 }
 
 void RenderViewImpl::OnWasHidden() {
   RenderWidget::OnWasHidden();
 
 #if defined(OS_ANDROID) && defined(ENABLE_WEBRTC)
   RenderThreadImpl::current()->video_capture_impl_manager()->
       SuspendDevices(true);
+  if (speech_recognition_dispatcher_)
+    speech_recognition_dispatcher_->AbortAllRecognitions();
 #endif
 
   if (webview())
     webview()->setVisibilityState(visibilityState(), false);
 
 #if defined(ENABLE_PLUGINS)
   for (PepperPluginSet::iterator i = active_pepper_instances_.begin();
        i != active_pepper_instances_.end(); ++i)
     (*i)->PageVisibilityChanged(false);
 
@@ skipping 711 matching lines @@
     std::vector<gfx::Size> sizes;
     ConvertToFaviconSizes(icon_urls[i].sizes(), &sizes);
     if (!url.isEmpty())
       urls.push_back(
           FaviconURL(url, ToFaviconType(icon_urls[i].iconType()), sizes));
   }
   SendUpdateFaviconURL(urls);
 }
 
 }  // namespace content