Move uils and sksl to a common sources GYP file.

gyp/skia_for_chromium_defines.gypi

-# Copyright 2014 Google Inc.
-# Use of this source code is governed by a BSD-style license that can be
-# found in the LICENSE file.
-
-# THIS FILE IS OBSOLETE. It will be deleted pending a two-sided update to
-# Chromium. Please update the new list in gn/shared_sources.gni.
-
-# This file is included by chrome's skia/skia_common.gypi, and is intended to
-# augment the skia flags that are set there.
-
-{
-  'variables': {
-
-    # These flags will be defined in chromium
-    #
-    # If these become 'permanent', they should be moved into skia_common.gypi
-    #
-    'skia_for_chromium_defines': [
-      'SK_IGNORE_LINEONLY_AA_CONVEX_PATH_OPTS',
-    ],
-  },
-}