Hotword Audio Verification App: Adds to hotwordPrivate API

chrome/common/extensions/api/hotword_audio_verification_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.hotwordAudioVerificationPrivate</code> API allows
+// apps to access and mutate the preference for enabling always-on-hotword
+// search.
+
+[nodoc] namespace hotwordAudioVerificationPrivate {
+
+  dictionary LaunchState {
+    // The mode that the app was launched in.
+    long launchMode;
+  };
+
+  callback LaunchStateCallback = void(LaunchState result);
+
+  interface Functions {
+    // Retrieves the state that the app was launched in.
+    // The result is put into a LaunchState object.
+    static void getLaunchState(LaunchStateCallback callback);
+  };
+};