[Hotword] Set up hotwording to be externally loaded component extension. Only load if the field tri…

chrome/common/extensions/extension_constants.h

 // Copyright (c) 2012 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_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 
 #include <string>
 
 #include "base/basictypes.h"
@@ skipping 91 matching lines @@
 
   // The extension id of the HTerm app for ChromeOS.
   extern const char kHTermAppId[];
 
   // The extension id of the HTerm dev app for ChromeOS.
   extern const char kHTermDevAppId[];
 
   // The extension id of the Crosh component app for ChromeOS.
   extern const char kCroshBuiltinAppId[];
 
+  // The extension id of the hotword voice search trigger extension.
+  extern const char kHotwordExtensionId[];
+
   // The extension id of the PDF extension.
   extern const char kPdfExtensionId[];
 
   // The extension id of the Office Viewer component extension.
   extern const char kQuickOfficeComponentExtensionId[];
 
   // The extension id of the Office Viewer dev extension.
   extern const char kQuickOfficeDevExtensionId[];
 
   // The extension id of the Office Viewer extension.
@@ skipping 217 matching lines @@
     LAUNCH_CONTAINER_WINDOW,
     LAUNCH_CONTAINER_PANEL,
     LAUNCH_CONTAINER_TAB,
     // For platform apps, which don't actually have a container (they just get a
     // "onLaunched" event).
     LAUNCH_CONTAINER_NONE
   };
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_