Added CSSPropertyAPI and CSS padding properties which implement this API

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

Index: third_party/WebKit/Source/core/css/properties/CSSPropertyDescriptor.h
diff --git a/third_party/WebKit/Source/core/css/properties/CSSPropertyDescriptor.h b/third_party/WebKit/Source/core/css/properties/CSSPropertyDescriptor.h
new file mode 100644
index 0000000000000000000000000000000000000000..5960330f71f9c8058e4c5c98ed086ed9d16b9c9d
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyDescriptor.h
@@ -0,0 +1,25 @@
+// 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/CSSPropertyNames.h"
+
+namespace blink {
+
+class CSSValue;
+class CSSParserTokenRange;
+class CSSParserContext;
+
+// Stores function pointers matching those declared in CSSPropertyAPI.
+struct CSSPropertyDescriptor {
+  const CSSValue* (*parseSingleValue)(CSSParserTokenRange&,
+                                      const CSSParserContext&);
+  CSSPropertyID id;
+
+  // This is used to check if the descriptor is valid and is for internal use
+  // only.
+  bool isValid;
+  static const CSSPropertyDescriptor& get(CSSPropertyID);

[sashab, 2016/12/05 23:58:12]

get() method needs a comment since we want people to call it :)

[aazzam, 2016/12/06 00:30:10]

done

+};
+
+}  // namespace blink