Added CSSPropertyAPI and CSS padding properties which implement this API

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.h
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.h b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.h
new file mode 100644
index 0000000000000000000000000000000000000000..4e001afb0be6e05cf373e4667308854918e54718
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyAPIPadding.h
@@ -0,0 +1,32 @@
+// 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.
+
+#ifndef CSSPropertyAPIPadding_h
+#define CSSPropertyAPIPadding_h
+
+#include "core/CSSPropertyNames.h"
+#include "core/css/properties/CSSPropertyAPI.h"
+
+namespace blink {
+
+class CSSParserTokenRange;
+class CSSParserContext;
+
+class CSSPropertyAPIWebkitPadding : public CSSPropertyAPI {
+ public:
+  static const CSSValue* parseSingleValue(CSSParserTokenRange&,
+                                          const CSSParserContext&);
+};
+
+class CSSPropertyAPIWebkitPaddingStart : public CSSPropertyAPIWebkitPadding {};

[Z_DONOTUSE, 2016/12/08 03:20:05]

Nit: It's really strange to see empty classes like this. Maybe add a TODO to
autogenerate this file to make it more clear that this is an intermediary state?

[aazzam, 2016/12/08 04:16:36]

Yep - it's already being autogenerated, i'm just submitting that CL after this
one :) added the TODO for the interim

+
+class CSSPropertyAPIWebkitPaddingEnd : public CSSPropertyAPIWebkitPadding {};
+
+class CSSPropertyAPIWebkitPaddingBefore : public CSSPropertyAPIWebkitPadding {};
+
+class CSSPropertyAPIWebkitPaddingAfter : public CSSPropertyAPIWebkitPadding {};
+
+}  // namespace blink
+
+#endif  // CSSPropertyAPIPadding_h