Add SK_ADDING_src_ports_SkFontConfigInterface_cpp.

skia/BUILD.gn

 # Copyright (c) 2013 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 import("//third_party/skia/gn/shared_sources.gni")
 
 if (current_cpu == "arm") {
@@ skipping 30 matching lines @@
     "//third_party/skia/include/effects",
     "//third_party/skia/include/images",
     "//third_party/skia/include/lazy",
     "//third_party/skia/include/pathops",
     "//third_party/skia/include/pdf",
     "//third_party/skia/include/pipe",
     "//third_party/skia/include/ports",
     "//third_party/skia/include/utils",
   ]
 
-  defines = [ "SK_IGNORE_DW_GRAY_FIX" ]
+  defines = [
+    "SK_IGNORE_DW_GRAY_FIX",
+    "SK_ADDING_src_ports_SkFontConfigInterface_cpp",
+  ]
   defines += skia_for_chromium_defines
 
   defines += []
 
   if (skia_build_no_opts) {
     defines += [ "SK_BUILD_NO_OPTS" ]
   }
 
   if (is_component_build) {
     defines += [
@@ skipping 652 matching lines @@
 
     deps = [
       ":skia",
       "//base",
       "//base/test:test_support",
       "//build/config/sanitizers:deps",
       "//build/win:default_exe_manifest",
     ]
   }
 }