DNR Prototype: With flatbuffers

extensions/browser/guest_view/extension_view/BUILD.gn

 # Copyright 2016 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.
 
 source_set("extension_view") {
   sources = [
     "extension_view_constants.cc",
     "extension_view_constants.h",
     "extension_view_guest.cc",
     "extension_view_guest.h",
   ]
 
   deps = [
     "//content/public/common",
     "//extensions/common/api",
     "//extensions/strings",
   ]
+
+  include_dirs = [ "//third_party/flatbuffers/src/include/" ]
 }