Add stubs for brailleDisplayPrivate extension API.

chrome/common/extensions/permissions/permission_set_unittest.cc

 // 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.
 
 #include "base/command_line.h"
 #include "base/json/json_file_value_serializer.h"
 #include "base/logging.h"
 #include "base/path_service.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/common/chrome_paths.h"
@@ skipping 680 matching lines @@
   // If you've turned on the experimental command-line flag, we don't need
   // to warn you further.
   skip.insert(APIPermission::kExperimental);
 
   // The Identity API has its own server-driven permission prompts.
   skip.insert(APIPermission::kIdentity);
 
   // These are private.
   skip.insert(APIPermission::kAutoTestPrivate);
   skip.insert(APIPermission::kBookmarkManagerPrivate);
+  skip.insert(APIPermission::kBrailleDisplayPrivate);
   skip.insert(APIPermission::kChromeosInfoPrivate);
   skip.insert(APIPermission::kCloudPrintPrivate);
   skip.insert(APIPermission::kCommandLinePrivate);
   skip.insert(APIPermission::kDeveloperPrivate);
   skip.insert(APIPermission::kDial);
   skip.insert(APIPermission::kDownloadsInternal);
   skip.insert(APIPermission::kEchoPrivate);
   skip.insert(APIPermission::kEnterprisePlatformKeysPrivate);
   skip.insert(APIPermission::kFeedbackPrivate);
   skip.insert(APIPermission::kFileBrowserHandlerInternal);
@@ skipping 659 matching lines @@
 
   scoped_refptr<Extension> extension_dwr(
       LoadManifest("permissions", "web_request_all_host_permissions.json"));
   scoped_refptr<const PermissionSet> permissions_dwr(
       extension_dwr->GetActivePermissions());
 
   EXPECT_FALSE(permissions->HasLessPrivilegesThan(permissions_dwr.get(),
                                                   extension->GetType()));
 }
 }  // namespace extensions