Files: Add basic implementation of Directory and some basic tests.

services/files/BUILD.gn

 # Copyright 2014 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.
 
 import("//mojo/public/mojo_application.gni")
 import("//mojo/public/tools/bindings/mojom.gni")
 
 mojo_native_application("files") {
   sources = [
     "directory_impl.cc",
     "directory_impl.h",
     "file_impl.cc",
     "file_impl.h",
     "files_impl.cc",
     "files_impl.h",
     "futimens.h",
     "futimens_android.cc",
     "main.cc",
+    "shared_impl.cc",
+    "shared_impl.h",
     "util.cc",
     "util.h",
   ]
 
   deps = [
     ":bindings",
     "//base",
     "//mojo/application",
     "//mojo/common",
     "//mojo/public/cpp/application",
+    "//mojo/public/cpp/bindings:callback",
     "//mojo/public/cpp/system",
   ]
 }
 
 mojom("bindings") {
   sources = [
     "directory.mojom",
     "file.mojom",
     "files.mojom",
     "types.mojom",
@@ skipping 12 matching lines @@
   deps = [
     ":bindings",
     "//base",
     "//mojo/application",
     "//mojo/application:test_support",
     "//mojo/public/cpp/bindings",
   ]
 
   data_deps = [ ":files" ]
 }