Adds the speech recognition button to the app-list searchbox.

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 b316dd61329ce3e90d6e0ff2042f12d6ffc431e8..972a3adfe87cbc2480313c2bbcd4262f03c3c249 100644
--- a/chrome/browser/resources/app_list/speech_manager.js
+++ b/chrome/browser/resources/app_list/speech_manager.js
@@ -100,6 +100,7 @@ cr.define('speech', function() {
    */
   SpeechManager.prototype.onSpeechRecognitionStarted = function() {
     this.setState_(SpeechState.RECOGNIZING);
+    chrome.send('setSpeechRecognitionState', [true]);
   };
 
   /**
@@ -108,6 +109,7 @@ cr.define('speech', function() {
   SpeechManager.prototype.onSpeechRecognitionEnded = function() {
     // Restarts the hotword recognition.
     this.audioManager_.start();
+    chrome.send('setSpeechRecognitionState', [false]);
   };
 
   /**
@@ -148,6 +150,18 @@ cr.define('speech', function() {
     this.setState_(SpeechState.READY);
   };
 
+  /**
+   * Toggles the current state of speech recognition.
+   */
+  SpeechManager.prototype.toggleSpeechRecognition = function() {
+    if (this.state == SpeechState.RECOGNIZING) {
+      this.speechRecognitionManager_.stop();
+    } else {
+      this.audioManager_.stop();
+      this.speechRecognitionManager_.start();
+    }
+  };
+
   return {
     SpeechManager: SpeechManager
   };