Fix GN Build after Skia roll.

Skia introduced a new define that is required to build.

TBR=djsollen@chromium.org

Review URL: https://codereview.chromium.org/234203002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263100 0039d316-1c4b-4281-b951-d872f2087c98

skia/skia_gn_files.gypi

@@ -19,6 +19,7 @@
     'SK_SUPPORT_LEGACY_GETTOTALCLIP',
     'SK_SUPPORT_LEGACY_LAYERRASTERIZER_API=1',
     'SK_SUPPORT_LEGACY_PUBLICEFFECTCONSTRUCTORS=1',
+    'SK_SUPPORT_LEGACY_N32_NAME',
     'SK_USE_DISCARDABLE_SCALEDIMAGECACHE',
     'SK_WILL_NEVER_DRAW_PERSPECTIVE_TEXT',
   ],