Declare providing extension capabilities in the manifest.

extensions/common/manifest_constants.cc

 // Copyright 2013 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.
 
 #include "extensions/common/manifest_constants.h"
 
 namespace extensions {
 
 namespace manifest_keys {
 
@@ skipping 162 matching lines @@
 const char kUrlHandlerTitle[] = "title";
 const char kVersion[] = "version";
 const char kVersionName[] = "version_name";
 const char kWebAccessibleResources[] = "web_accessible_resources";
 const char kWebURLs[] = "app.urls";
 const char kWebview[] = "webview";
 const char kWebviewAccessibleResources[] = "accessible_resources";
 const char kWebviewName[] = "name";
 const char kWebviewPartitions[] = "partitions";
 const char kWhitelist[] = "whitelist";
+#if defined(OS_CHROMEOS)
+const char kFileSystemProvider[] = "file_system_provider";
+#endif
 
 }  // namespace manifest_keys
 
 namespace manifest_values {
 
 const char kApiKey[] = "api_key";
 const char kBrowserActionCommandEvent[] = "_execute_browser_action";
 const char kIncognitoSplit[] = "split";
 const char kIncognitoSpanning[] = "spanning";
 const char kIsolatedStorage[] = "storage";
@@ skipping 498 matching lines @@
 const char kReservedMessageFound[] =
     "Reserved key * found in message catalog.";
 const char kUnrecognizedManifestKey[] = "Unrecognized manifest key '*'.";
 const char kUnrecognizedManifestProperty[] =
     "Unrecognized property '*' of manifest key '*'.";
 const char kWebRequestConflictsWithLazyBackground[] =
     "The 'webRequest' API cannot be used with event pages.";
 #if defined(OS_CHROMEOS)
 const char kIllegalPlugins[] =
     "Extensions cannot install plugins on Chrome OS";
+const char kInvalidFileSystemProvider[] =
+    "Invalid value for 'file_system_provider'.";
 #endif
 
 }  // namespace manifest_errors
 
 }  // namespace extensions