Add CSS support for font-variation-settings

third_party/WebKit/Source/core/css/BUILD.gn

 # Copyright 2016 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("//third_party/WebKit/Source/core/core.gni")
 
 blink_core_sources("css") {
   split_count = 5
   sources = [
     "ActiveStyleSheets.cpp",
@@ skipping 35 matching lines @@
     "CSSFontFaceSource.h",
     "CSSFontFaceSrcValue.cpp",
     "CSSFontFaceSrcValue.h",
     "CSSFontFamilyValue.cpp",
     "CSSFontFamilyValue.h",
     "CSSFontFeatureValue.cpp",
     "CSSFontFeatureValue.h",
     "CSSFontSelector.cpp",
     "CSSFontSelector.h",
     "CSSFontSelectorClient.h",
+    "CSSFontVariationValue.cpp",
+    "CSSFontVariationValue.h",
     "CSSFunctionValue.cpp",
     "CSSFunctionValue.h",
     "CSSGlobalRuleSet.cpp",
     "CSSGlobalRuleSet.h",
     "CSSGradientValue.cpp",
     "CSSGradientValue.h",
     "CSSGridAutoRepeatValue.cpp",
     "CSSGridAutoRepeatValue.h",
     "CSSGridLineNamesValue.cpp",
     "CSSGridLineNamesValue.h",
@@ skipping 320 matching lines @@
     "resolver/TransformBuilder.h",
     "resolver/ViewportStyleResolver.cpp",
     "resolver/ViewportStyleResolver.h",
   ]
 
   configs += [
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     "//build/config/compiler:no_size_t_to_int_warning",
   ]
 }