XPS, DM: add SkDocument::CreateXPS

gyp/xps.gyp

 {
   'targets': [
     {
       'target_name': 'xps',
       'product_name': 'skia_xps',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'sfnt.gyp:sfnt',
       ],
       'include_dirs': [
         '../include/device/xps',
         '../include/utils/win',
         '../src/core', # needed to get SkGlyphCache.h
         '../src/utils', # needed to get SkBitSet.h
       ],
       'sources': [
         '../include/device/xps/SkConstexprMath.h',
         '../include/device/xps/SkXPSDevice.h',
 
         '../src/device/xps/SkXPSDevice.cpp',
+        '../src/doc/SkDocument_XPS.cpp',
       ],
+      'defines': [ 'SK_SUPPORT_XPS', ],
       'conditions': [
         [ 'skia_os == "win"', {
           'link_settings': {
             'libraries': [
               '-lt2embed.lib',
               '-lfontsub.lib',
             ],
           },
         },{ #else if 'skia_os != "win"'
           'include_dirs!': [
@@ skipping 17 matching lines @@
           }],
         ],
         'include_dirs': [
           '../include/device/xps',
           '../src/utils', # needed to get SkBitSet.h
         ],
       },
     },
   ],
 }