Adds speech recognition test case to AppListStartPageWebUITest.

chrome/browser/resources/app_list/speech_manager.js

 // Copyright 2013 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.
 
 /**
  * @fileoverview The class to Manage both offline / online speech recognition.
  */
 
 <include src="plugin_manager.js"/>
 <include src="audio_manager.js"/>
@@ skipping 26 matching lines @@
     this.setState_(SpeechState.READY);
   }
 
   /**
    * Updates the state.
    *
    * @param {SpeechState} newState The new state.
    * @private
    */
   SpeechManager.prototype.setState_ = function(newState) {
+    if (this.state == newState)
+      return;
+
     this.state = newState;
     chrome.send('setSpeechRecognitionState', [this.state]);
   };
 
   /**
    * Called with the mean audio level when audio data arrives.
    *
    * @param {cr.event.Event} event The event object for the audio data.
    * @private
    */
@@ skipping 178 matching lines @@
       if (this.audioManager_.state == speech.AudioState.STOPPED)
         this.audioManager_.start();
       this.speechRecognitionManager_.start();
     }
   };
 
   return {
     SpeechManager: SpeechManager
   };
 });