XPS, DM: add SkDocument::CreateXPS

gyp/dm.gypi

 # GYP for "dm" (Diamond Master, a.k.a Dungeon master, a.k.a GM 2).
 {
   'include_dirs': [
     '../dm',
     '../gm',
     '../src/core',
     '../src/effects',
     '../src/images',
     '../src/lazy',
     '../src/pipe/utils/',
     '../src/utils',
     '../src/utils/debugger',
     '../tests',
     '../tools',
   ],
   'dependencies': [
     'etc1.gyp:libetc1',
     'flags.gyp:flags',
     'jsoncpp.gyp:jsoncpp',
     'skia_lib.gyp:skia_lib',
     'svg.gyp:svg',
     'tools.gyp:crash_handler',
     'tools.gyp:proc_stats',
     'tools.gyp:sk_tool_utils',
     'tools.gyp:timer',
     'xml.gyp:xml',
+    'xps.gyp:xps',
   ],
   'includes': [
     'gmslides.gypi',
     'pathops_unittest.gypi',
     'tests.gypi',
   ],
   'sources': [
     '../dm/DM.cpp',
     '../dm/DMSrcSink.cpp',
     '../dm/DMJsonWriter.cpp',
     '../gm/gm.cpp',
 
     '../src/pipe/utils/SamplePipeControllers.cpp',
     '../src/utils/debugger/SkDebugCanvas.cpp',
     '../src/utils/debugger/SkDrawCommand.cpp',
     '../src/utils/debugger/SkObjectParser.cpp',
   ],
   'conditions': [
     [ 'skia_gpu == 1', {
       'dependencies': [ 'gputest.gyp:skgputest' ],
     }],
   ],
 }