Added CSSPropertyAPI and CSS padding properties which implement this API

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.cpp
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.cpp b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..5a46c31ef963338e683577698594e5d8feee6c3c
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.cpp
@@ -0,0 +1,20 @@
+// 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/CSSPropertyAPIPadding.h"
+
+#include "core/css/parser/CSSParserTokenRange.h"
+#include "core/css/parser/CSSPropertyParserHelpers.h"
+
+namespace blink {
+
+const CSSValue* CSSPropertyAPIWebkitPadding::parseSingleValue(
+    CSSParserTokenRange& range,
+    const CSSParserContext& context) {
+  return consumeLengthOrPercent(
+      range, context.mode(), ValueRangeNonNegative,
+      CSSPropertyParserHelpers::UnitlessQuirk::Forbid);
+}
+
+}  // namespace blink