Make the Skia GN build work.

skia/skia_gn_files.gypi

Index: skia/skia_gn_files.gypi
diff --git a/skia/skia_gn_files.gypi b/skia/skia_gn_files.gypi
index 42bdc47a48c307a3a7859d9c417ac616981f2923..7f7495996a5962e38e8ef77f0a7a612a6a1f8cd4 100644
--- a/skia/skia_gn_files.gypi
+++ b/skia/skia_gn_files.gypi
@@ -5,12 +5,8 @@
   'skia_library_sources': [
     '<(skia_src_path)/ports/SkImageGenerator_none.cpp',
 
-    '<(skia_src_path)/fonts/SkFontMgr_fontconfig.cpp',
     '<(skia_src_path)/fonts/SkFontMgr_indirect.cpp',
     '<(skia_src_path)/fonts/SkRemotableFontMgr.cpp',
-    '<(skia_src_path)/ports/SkFontConfigInterface_direct.cpp',
-    '<(skia_src_path)/ports/SkFontConfigInterface_direct_factory.cpp',
-    '<(skia_src_path)/ports/SkFontHost_fontconfig.cpp',
     '<(skia_src_path)/ports/SkFontHost_FreeType_common.cpp',
     '<(skia_src_path)/ports/SkFontHost_FreeType.cpp',
     '<(skia_src_path)/ports/SkFontHost_mac.cpp',
@@ -22,9 +18,9 @@
     '<(skia_src_path)/ports/SkGlobalInitialization_default.cpp',
     '<(skia_src_path)/ports/SkImageEncoder_none.cpp',
     '<(skia_src_path)/ports/SkOSFile_posix.cpp',
-    '<(skia_src_path)/ports/SkRemotableFontMgr_win_dw.cpp',
     '<(skia_src_path)/ports/SkOSFile_stdio.cpp',
     '<(skia_src_path)/ports/SkOSFile_win.cpp',
+    '<(skia_src_path)/ports/SkRemotableFontMgr_win_dw.cpp',
     '<(skia_src_path)/ports/SkScalerContext_win_dw.cpp',
     '<(skia_src_path)/ports/SkTLS_pthread.cpp',
     '<(skia_src_path)/ports/SkTLS_win.cpp',
@@ -39,5 +35,11 @@
 
     #testing
     '<(skia_src_path)/fonts/SkGScalerContext.cpp',
+
+    #pdfium
+    '<(skia_src_path)/ports/SkDiscardableMemory_none.cpp',
+    '<(skia_src_path)/ports/SkFontMgr_custom.cpp',
+    '<(skia_src_path)/ports/SkFontMgr_custom_empty_factory.cpp',
+    '<(skia_src_path)/ports/SkMemory_malloc.cpp',
   ],
 }