win32: Add a PlatformWindow implementation for Windows.

mojo/mojo_services.gypi

 # Copyright (c) 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.
 
 {
   'targets': [
     {
       'target_name': 'mojo_echo_bindings',
       'type': 'static_library',
       'sources': [
@@ skipping 304 matching lines @@
         ['OS=="win" or OS=="android" or OS=="linux" or OS=="mac"', {
           'sources!': [
             'services/native_viewport/native_viewport_stub.cc',
           ],
         }],
         ['OS=="android"', {
           'dependencies': [
             'mojo_jni_headers',
           ],
         }],
+        ['OS=="win"', {
+          'dependencies': [
+            '../ui/platform_window/win/win_window.gyp:win_window',
+          ],
+        }],
         ['use_x11==1', {
           'dependencies': [
             '../ui/platform_window/x11/x11_window.gyp:x11_window',
           ],
         }],
       ],
     },
     {
       'target_name': 'mojo_navigation_bindings',
       'type': 'static_library',
@@ skipping 517 matching lines @@
             'mojo_system_impl',
           ],
           'sources': [
             'services/dbus_echo/dbus_echo_service.cc',
           ],
         },
       ],
     }],
   ],
 }