fix windows build; add blend modes

third_party/third_party.gyp

 # Copyright 2014 PDFium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 {
   'variables': {
     'pdf_enable_xfa%': 0,  # Set to 1 by standalone.gypi in standalone builds.
+    'pdf_use_skia%': 0,
   },
   'target_defaults': {
     'defines': [
       'OPJ_STATIC',
       'PNG_PREFIX',
       'PNG_USE_READ_MACROS',
       '_CRT_SECURE_NO_WARNINGS',
     ],
     'include_dirs': [
       # This is implicit in GN.
@@ skipping 55 matching lines @@
         'freetype/src/cid/type1cid.c',
         'freetype/src/psaux/psaux.c',
         'freetype/src/pshinter/pshinter.c',
         'freetype/src/psnames/psmodule.c',
         'freetype/src/raster/raster.c',
         'freetype/src/sfnt/sfnt.c',
         'freetype/src/smooth/smooth.c',
         'freetype/src/truetype/truetype.c',
         'freetype/src/type1/type1.c',
       ],
+      'conditions': [
+        ['pdf_use_skia==1', {
+          'sources': [
+           'freetype/src/base/ftfntfmt.c',
+           'freetype/src/base/ftfstype.c',
+           'freetype/src/base/fttype1.c',
+          ],
+        }],
+      ],
       'variables': {
         'clang_warning_flags': [
           # open_face_PS_from_sfnt_stream() and open_face_from_buffer() in
           # ftbase.h are unused.
           '-Wno-unused-function',
         ],
       },
     },
     {
       'target_name': 'fx_agg',
@@ skipping 306 matching lines @@
             'libtiff/tif_version.c',
             'libtiff/tif_warning.c',
             'libtiff/tif_write.c',
             'libtiff/tif_zip.c',
           ],
         },
       ],
     }],
   ],
 }