Notify hotwording extension of microphone state change.

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

Index: chrome/browser/extensions/api/hotword_private/hotword_private_api.cc
diff --git a/chrome/browser/extensions/api/hotword_private/hotword_private_api.cc b/chrome/browser/extensions/api/hotword_private/hotword_private_api.cc
index d38013a83fd14dcef5528c3625214ee2a6957546..a1c46611fecd5b06d7deccbdd8f7d9bcdd306417 100644
--- a/chrome/browser/extensions/api/hotword_private/hotword_private_api.cc
+++ b/chrome/browser/extensions/api/hotword_private/hotword_private_api.cc
@@ -106,6 +106,16 @@ 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))