Compile the skia library for windows using gn.

third_party/sfntly/BUILD.gn

Index: third_party/sfntly/BUILD.gn
diff --git a/third_party/sfntly/BUILD.gn b/third_party/sfntly/BUILD.gn
index 845c6ed198851393fb272741a49c2285b234a8d1..07a7df900371a16bab4dbc77ba5ab771d0f22c83 100644
--- a/third_party/sfntly/BUILD.gn
+++ b/third_party/sfntly/BUILD.gn
@@ -70,4 +70,13 @@ third_party("sfntly") {
     "../externals/sfntly/cpp/src/sfntly/tools/subsetter/subsetter.cc",
     "../externals/sfntly/cpp/src/sfntly/tools/subsetter/table_subsetter_impl.cc",
   ]
+
+  if (is_win) {
+    defines += [ "WIN32", "NOMINMAX" ]

[mtklein, 2016/09/14 21:25:14]

Probably do not need NOMINMAX again.

Better check WIN32 matters too?

[herb_g, 2016/09/16 19:54:15]

Done.

+    #cflags += [
+    #  "/wd4267",
+    #  "/wd4244",

[mtklein, 2016/09/14 21:25:14]

Can you make the template in third_party/third_party.gni suppress all warnings?

[herb_g, 2016/09/16 19:54:15]

Done.

+    #]
+    cflags_cc = [ "/EHsc", ]

[mtklein, 2016/09/14 21:25:14]

Let's confirm SFNTLY_NO_EXCEPTION doesn't work enough?

[herb_g, 2016/09/16 19:54:15]

Done.

+  }
 }