Notify hotwording extension of microphone state change.

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

 // 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.
 
 #include "chrome/browser/extensions/api/hotword_private/hotword_private_api.h"
 
 #include <string>
 
 #include "base/lazy_instance.h"
 #include "base/prefs/pref_service.h"
@@ skipping 88 matching lines @@
 }
 
 void HotwordPrivateEventService::OnDeleteSpeakerModel() {
   SignalEvent(api::hotword_private::OnDeleteSpeakerModel::kEventName);
 }
 
 void HotwordPrivateEventService::OnSpeakerModelExists() {
   SignalEvent(api::hotword_private::OnSpeakerModelExists::kEventName);
 }
 
+void HotwordPrivateEventService::OnMicrophoneStateChanged(bool enabled) {
+  EventRouter* router = EventRouter::Get(profile_);

[kcarattini, 2015/03/31 23:31:46]

check for a null return value (like the function below)?

[calamity, 2015/04/01 02:36:10]

Made an overload for SignalEvent.

[kcarattini, 2015/04/01 05:04:36]

Even better.

+
+  scoped_ptr<base::ListValue> args(new base::ListValue());
+  args->AppendBoolean(enabled);
+  scoped_ptr<Event> event(new Event(
+      api::hotword_private::OnMicrophoneStateChanged::kEventName, args.Pass()));
+  router->BroadcastEvent(event.Pass());
+}
+
 void HotwordPrivateEventService::SignalEvent(const std::string& event_name) {
   EventRouter* router = EventRouter::Get(profile_);
   if (!router || !router->HasEventListener(event_name))
     return;
   scoped_ptr<base::ListValue> args(new base::ListValue());
   scoped_ptr<Event> event(new Event(event_name, args.Pass()));
   router->BroadcastEvent(event.Pass());
 }
 
 bool HotwordPrivateSetEnabledFunction::RunSync() {
@@ skipping 354 matching lines @@
   HotwordService* hotword_service =
       HotwordServiceFactory::GetForProfile(GetProfile());
   if (!hotword_service)
     return false;
 
   hotword_service->SpeakerModelExistsComplete(params->exists);
   return true;
 }
 
 }  // namespace extensions