Enables the 'hotword not listening' icon in the search box.

ui/app_list/speech_ui_model_observer.h

 // 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.
 
 #ifndef UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
 #define UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_
 
 #include "base/basictypes.h"
 #include "base/strings/string16.h"
 #include "ui/app_list/app_list_export.h"
 
 namespace app_list {
 
 enum SpeechRecognitionState {
-  SPEECH_RECOGNITION_NOT_STARTED = 0,
-  SPEECH_RECOGNITION_ON,
+  SPEECH_RECOGNITION_OFF = 0,
+  SPEECH_RECOGNITION_READY,
+  SPEECH_RECOGNITION_HOTWORD_LISTENING,
+  SPEECH_RECOGNITION_RECOGNIZING,
   SPEECH_RECOGNITION_IN_SPEECH,
+  SPEECH_RECOGNITION_STOPPING,
 };
 
 class APP_LIST_EXPORT SpeechUIModelObserver {
  public:
   // Invoked when sound level for the speech recognition has changed. |level|
   // represents the current sound-level in the range of [0, 255].
   virtual void OnSpeechSoundLevelChanged(uint8 level) {}
 
   // Invoked when a speech result arrives. |is_final| is true only when the
   // speech result is final.
   virtual void OnSpeechResult(const base::string16& result, bool is_final) {}
 
   // Invoked when the state of speech recognition is changed.
   virtual void OnSpeechRecognitionStateChanged(
       SpeechRecognitionState new_state) {}
 
  protected:
   virtual ~SpeechUIModelObserver() {}
 };
 
 }  // namespace app_list
 
 #endif  // UI_APP_LIST_SPEECH_UI_MODEL_OBSERVER_H_