Add BUILD.gn files for weborigin/weborigin_unittests

tools/gn/secondary/BUILD.gn

 # Copyright (c) 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.
 
 group("root") {
   deps = [
     "//base(//build/toolchain/nacl:x86_newlib)",
     "//chrome",
     "//crypto",
     "//ipc",
     "//net",
     "//net/third_party/nss:ssl",
     "//sdch",
     "//third_party/icu:icudata",
     "//third_party/leveldatabase",
     "//third_party/zlib",
+    "//third_party/WebKit/Source/weborigin",
     "//third_party/WebKit/Source/wtf",
     "//skia",
     "//tools/gn",
     "//url",
   ]
 }