Preliminary support for Windows manifests in the GN build.

build/win/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("//build/config/win/manifest.gni")
+
+# Depending on this target will cause the manifests for Chrome's default
+# Windows and common control compatibility and elevation for executables.
+windows_manifest("default_exe_manifest") {
+  sources = [
+    as_invoker_manifest,
+    common_controls_manifest,
+    default_compatibility_manifest,
+  ]
+  type = "exe"
+}