Minimal changes to make SampleAnimator do something useful.

gyp/ports.gyp

 # Port-specific Skia library code.
 {
   'targets': [
     {
       'target_name': 'ports',
       'product_name': 'skia_ports',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'core.gyp:*',
@@ skipping 26 matching lines @@
         '../src/ports/SkOSFile_posix.cpp',
         '../src/ports/SkOSFile_stdio.cpp',
         '../src/ports/SkOSFile_win.cpp',
         '../src/ports/SkDiscardableMemory_none.cpp',
         '../src/ports/SkPurgeableMemoryBlock_none.cpp',
        #'../src/ports/SkThread_none.cpp',
         '../src/ports/SkThread_pthread.cpp',
         '../src/ports/SkThread_win.cpp',
         '../src/ports/SkTime_Unix.cpp',
         '../src/ports/SkTime_win.cpp',
+        '../src/ports/SkXMLParser_expat.cpp',
        #'../src/ports/SkTLS_none.cpp',
         '../src/ports/SkTLS_pthread.cpp',
         '../src/ports/SkTLS_win.cpp',
         '../src/ports/SkXMLParser_empty.cpp',
       ],
       'conditions': [
         [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos", "nacl", "android"]', {
           'sources': [
             '../src/ports/SkFontHost_FreeType.cpp',
             '../src/ports/SkFontHost_FreeType_common.cpp',
           ],
           'dependencies': [
             'freetype.gyp:freetype',
           ],
         }],
         [ 'skia_os in ["linux", "freebsd", "openbsd", "solaris", "chromeos"]', {
           'link_settings': {
             'libraries': [
               '-lfontconfig',
               '-ldl',
+              '-lexpat',
             ],
           },
           'sources': [
             '../src/fonts/SkFontMgr_fontconfig.cpp',
             '../src/ports/SkFontHost_fontconfig.cpp',
             '../src/ports/SkFontConfigInterface_direct.cpp',
           ],
         }],
         [ 'skia_os == "nacl"', {
           'sources': [
@@ skipping 97 matching lines @@
       },
     },
   ],
 }
 
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