Implements CSSPropertyAPI for the -webkit-border-[start|end|before|after]-width properties.

third_party/WebKit/Source/core/css/properties/CSSPropertyWebkitBorderWidthUtils.cpp

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyWebkitBorderWidthUtils.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyWebkitBorderWidthUtils.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyWebkitBorderWidthUtils.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..cf8e4c30769f9cb8fa3c999b209eab6ee3eab777
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyWebkitBorderWidthUtils.cpp
@@ -0,0 +1,17 @@
+// Copyright 2017 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.
+
+#include "core/css/properties/CSSPropertyWebkitBorderWidthUtils.h"
+
+namespace blink {
+
+CSSValue* CSSPropertyWebkitBorderWidthUtils::ConsumeBorderWidth(
+    CSSParserTokenRange& range,
+    CSSParserMode css_parser_mode,
+    CSSPropertyParserHelpers::UnitlessQuirk unitless) {
+  return CSSPropertyParserHelpers::ConsumeLineWidth(range, css_parser_mode,
+                                                    unitless);
+}
+
+}  // namespace blink