Notify hotwording extension of microphone state change.

chrome/browser/extensions/api/hotword_private/hotword_private_api.h

 // Copyright 2014 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 CHROME_BROWSER_EXTENSIONS_API_HOTWORD_PRIVATE_HOTWORD_PRIVATE_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_HOTWORD_PRIVATE_HOTWORD_PRIVATE_API_H_
 
 #include "base/prefs/pref_change_registrar.h"
 #include "base/values.h"
 #include "chrome/browser/extensions/chrome_extension_function.h"
@@ skipping 26 matching lines @@
   void OnHotwordTriggered();
 
   void OnFinalizeSpeakerModel();
 
   void OnSpeakerModelSaved();
 
   void OnDeleteSpeakerModel();
 
   void OnSpeakerModelExists();
 
+  void OnMicrophoneStateChanged(bool enabled);
+
  private:
   friend class BrowserContextKeyedAPIFactory<HotwordPrivateEventService>;
 
   void SignalEvent(const std::string& event_name);
 
   Profile* profile_;
   PrefChangeRegistrar pref_change_registrar_;
 };
 
 
@@ skipping 190 matching lines @@
  protected:
   ~HotwordPrivateSpeakerModelExistsResultFunction() override {}
 
   // ExtensionFunction:
   bool RunSync() override;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_HOTWORD_PRIVATE_HOTWORD_PRIVATE_API_H_