Adds speech recognition test case to AppListStartPageWebUITest.

chrome/browser/resources/app_list/speech_manager.js

Index: chrome/browser/resources/app_list/speech_manager.js
diff --git a/chrome/browser/resources/app_list/speech_manager.js b/chrome/browser/resources/app_list/speech_manager.js
index ebb3afec9014604a8df9c24e7cbe5ab96f13bafa..c41b3c0fba7ef97657f77b962b86d08dc8f406c2 100644
--- a/chrome/browser/resources/app_list/speech_manager.js
+++ b/chrome/browser/resources/app_list/speech_manager.js
@@ -44,6 +44,9 @@ cr.define('speech', function() {
    * @private
    */
   SpeechManager.prototype.setState_ = function(newState) {
+    if (this.state == newState)
+      return;
+
     this.state = newState;
     chrome.send('setSpeechRecognitionState', [this.state]);
   };