Added PlatformHandle thunks.

mojo/platform_handle/BUILD.gn

+# Copyright 2015 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")
+
+source_set("platform_handle") {
+  sources = [
+    "platform_handle_private_thunks.cc",
+    "platform_handle_private_thunks.h",
+  ]
+
+  deps = [
+    ":defs",
+    "//mojo/public/c/system",
+  ]
+
+  defines = [ "PLATFORM_HANDLE_IMPLEMENTATION" ]
+}
+
+# Only targets that are registering the thunks should depend upon this.
+source_set("defs") {
+  sources = [
+    "platform_handle_functions.h",
+  ]
+  deps = [
+    "//mojo/public/c/system:system",
+  ]
+}
+
+mojo_native_application("platform_handle_apptest") {
+  output_name = "platform_handle_apptests"
+
+  testonly = true
+
+  sources = [
+    "platform_handle_apptest.cc",
+  ]
+
+  deps = [
+    ":defs",
+    ":platform_handle",
+    "//mojo/public/cpp/application:standalone",
+    "//mojo/public/cpp/application:test_support_standalone",
+    "//mojo/public/cpp/environment",
+    "//mojo/public/cpp/system",
+  ]
+}