win32: Add a PlatformWindow implementation for Windows.

Use this implementation for mojo native_viewport. It will also be used for
aura WindowTreeHost in subsequent patches.

BUG=none
[email protected]

Review URL: https://codereview.chromium.org/405813002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@284752 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/mojo/mojo_services.gypi b/mojo/mojo_services.gypi
index b557b28..2384d4aa 100644
--- a/mojo/mojo_services.gypi
+++ b/mojo/mojo_services.gypi
@@ -329,6 +329,11 @@
             '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',