Add in-profile external_extensions.json file for Chrome OS OEM customization.

chrome/common/chrome_paths.cc

 // Copyright (c) 2011 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 "chrome/common/chrome_paths.h"
 
 #include "base/command_line.h"
 #include "base/file_util.h"
 #include "base/logging.h"
 #include "base/path_service.h"
@@ skipping 302 matching lines @@
       cur = cur.Append(FILE_PATH_LITERAL("Managed Preferences"));
       char* login = getlogin();
       if (!login)
         return false;
       cur = cur.AppendASCII(login);
       if (!file_util::PathExists(cur))  // we don't want to create this
         return false;
       break;
     }
 #endif
+#if defined(OS_CHROMEOS)
+    case chrome::DIR_USER_EXTERNAL_EXTENSIONS: {
+      if (!PathService::Get(chrome::DIR_USER_DATA, &cur))
+        return false;
+      cur = cur.Append(FILE_PATH_LITERAL("External Extensions"));
+      break;
+    }
+#endif
     default:
       return false;
   }
 
   if (create_dir && !file_util::PathExists(cur) &&
       !file_util::CreateDirectory(cur))
     return false;
 
   *result = cur;
   return true;
 }
 
 // This cannot be done as a static initializer sadly since Visual Studio will
 // eliminate this object file if there is no direct entry point into it.
 void RegisterPathProvider() {
   PathService::RegisterProvider(PathProvider, PATH_START, PATH_END);
 }
 
 }  // namespace chrome