SkDocument base for pdf, xps, etc.

gyp/pdf.gyp

 {
   'targets': [
     {
       'target_name': 'pdf',
       'product_name': 'skia_pdf',
       'type': 'static_library',
       'standalone_static_library': 1,
       'dependencies': [
         'skia_lib.gyp:skia_lib',
         'zlib.gyp:zlib',
@@ skipping 29 matching lines @@
         '../src/pdf/SkPDFPage.h',
         '../src/pdf/SkPDFShader.cpp',
         '../src/pdf/SkPDFShader.h',
         '../src/pdf/SkPDFStream.cpp',
         '../src/pdf/SkPDFStream.h',
         '../src/pdf/SkPDFTypes.cpp',
         '../src/pdf/SkPDFTypes.h',
         '../src/pdf/SkPDFUtils.cpp',
         '../src/pdf/SkPDFUtils.h',
         '../src/pdf/SkTSet.h',
+
+        '../src/doc/SkDocument_PDF.cpp',
       ],
       # This section makes all targets that depend on this target
       # #define SK_SUPPORT_PDF and have access to the pdf header files.
       'direct_dependent_settings': {
         'defines': [
           'SK_SUPPORT_PDF',
         ],
         'include_dirs': [
           '../include/pdf',
         ],
       },
     },
   ],
 }
 
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