Added CSSPropertyAPI and CSS padding properties which implement this API

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

Index: third_party/WebKit/Source/core/css/properties/CSSPaddingProperties.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPaddingProperties.cpp b/third_party/WebKit/Source/core/css/properties/CSSPaddingProperties.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..d24654765983e287d4f8708fa5fc30ff89a274eb
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPaddingProperties.cpp
@@ -0,0 +1,43 @@
+// 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.
+
+#include "core/css/properties/CSSPaddingProperties.h"
+
+#include "core/css/parser/CSSParserTokenRange.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPIWebkitPaddingStart::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context) {
+  return consumeLengthOrPercent(
+      range, context.mode(), ValueRangeNonNegative,
+      CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
+}
+
+const CSSValue* CSSPropertyAPIWebkitPaddingEnd::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context) {
+  return consumeLengthOrPercent(
+      range, context.mode(), ValueRangeNonNegative,
+      CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
+}
+
+const CSSValue* CSSPropertyAPIWebkitPaddingBefore::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context) {
+  return consumeLengthOrPercent(
+      range, context.mode(), ValueRangeNonNegative,
+      CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
+}
+
+const CSSValue* CSSPropertyAPIWebkitPaddingAfter::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context) {
+  return consumeLengthOrPercent(
+      range, context.mode(), ValueRangeNonNegative,
+      CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
+}
+
+}  // namespace blink