XPS, DM: add SkDocument::CreateXPS

gyp/dm.gyp

Index: gyp/dm.gyp
diff --git a/gyp/dm.gyp b/gyp/dm.gyp
index c05826b9f5d9045b17a5b60789f349baff712e5d..be9af86d97cf41362af4d54f43c19c3aa1b4ab82 100644
--- a/gyp/dm.gyp
+++ b/gyp/dm.gyp
@@ -30,6 +30,10 @@
               'defines':      [ 'SK_BUILD_POPPLER' ],
               'dependencies': [ 'poppler.gyp:*' ],
           }],
+          ['skia_os == "win"',
+            { 'dependencies': ['xps.gyp:xps',], },
+            { 'dependencies': ['xps.gyp:xps_none',], }
+          ],
         ],
     }]
 }