Add the "file_handlers" manifest key for platform apps to replace "intents".

chrome/common/extensions/extension.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_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_H_
 
 #include <algorithm>
 #include <iosfwd>
 #include <map>
@@ skipping 877 matching lines @@
       const APIPermissionSet& api_permissions,
       string16* error);
   bool LoadBackgroundAllowJSAccess(
       const APIPermissionSet& api_permissions,
       string16* error);
   // Parses a single action in the manifest.
   bool LoadWebIntentAction(const std::string& action_name,
                            const base::DictionaryValue& intent_service,
                            string16* error);
   bool LoadWebIntentServices(string16* error);
+  bool LoadFileHandler(const std::string& handler_id,
+                       const base::DictionaryValue& handler_info,
+                       string16* error);
+  bool LoadFileHandlers(string16* error);
   bool LoadExtensionFeatures(const APIPermissionSet& api_permissions,
                              string16* error);
   bool LoadDevToolsPage(string16* error);
   bool LoadInputComponents(const APIPermissionSet& api_permissions,
                            string16* error);
   bool LoadContentScripts(string16* error);
   bool LoadPageAction(string16* error);
   bool LoadBrowserAction(string16* error);
   bool LoadScriptBadge(string16* error);
   bool LoadFileBrowserHandlers(string16* error);
@@ skipping 357 matching lines @@
 
   UpdatedExtensionPermissionsInfo(
       const Extension* extension,
       const PermissionSet* permissions,
       Reason reason);
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_H_