Adds HotwordPrivate API for integrating the hotword feature to AppLauncher

chrome/browser/search/hotword_client.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_SEARCH_HOTWORD_CLIENT_H_
+#define CHROME_BROWSER_SEARCH_HOTWORD_CLIENT_H_
+
+class HotwordClient {
+ public:
+  virtual ~HotwordClient() {}
+
+  // Called when the hotword recognition session state has been changed.
+  virtual void OnHotwordStateChanged(bool started) {}
+
+  // Called when the hotword is recognized.
+  virtual void OnHotwordRecognized() = 0;
+};
+
+#endif  // CHROME_BROWSER_SEARCH_HOTWORD_CLIENT_H_