Hotword Private API: Add function and event to query the existence of a speaker model

chrome/common/extensions/api/hotword_private.idl

 // 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.
 
 // The <code>chrome.hotwordPrivate</code> API allows extensions to access and
 // mutate the preference for enabling hotword search. It also provides
 // information on whether the hotword search is available. This API provides an
 // event interface to transmit to the extension a signal that the preference fo
 // hotword search has change.
 //
@@ skipping 131 matching lines @@
 
     // Stops the speaker model training.
     static void stopTraining(optional GenericDoneCallback callback);
 
     // Sets the audio history opt-in state.
     static void setAudioHistoryEnabled(boolean enabled,
                                        optional AudioHistoryCallback callback);
 
     // Gets the audio history opt-in state.
     static void getAudioHistoryEnabled(optional AudioHistoryCallback callback);
+
+    // Sends the result of whether a speaker model exists to the browser.
+    static void speakerModelExistsResult(boolean exists,
+                                         optional GenericDoneCallback callback);
   };
 
   interface Events {
     // Fired when the hotword detector enabled state should be changed.
     // This can be from various sources, e.g. a pref change or training
     // a speaker model.
     static void onEnabledChanged();
 
     // Fired when the browser wants to start a hotword session.
     static void onHotwordSessionRequested();
 
     // Fired when the browser wants to stop the requested hotword session.
     static void onHotwordSessionStopped();
 
     // Fired when the speaker model should be finalized.
     static void onFinalizeSpeakerModel();
 
     // Fired when the speaker model has been saved.
     static void onSpeakerModelSaved();
 
     // Fired when a hotword has triggered.
     static void onHotwordTriggered();
 
     // Fired when the speaker model should be deleted.
     static void onDeleteSpeakerModel();
+
+    // Fired when the browser wants to find out whether the speaker model
+    // exists.
+    static void onSpeakerModelExists();
   };
 };