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..3c9523751c566842368a0913d9b914dcab1c2158
--- /dev/null
+++ b/third_party/WebKit/Source/core/css/properties/CSSPropertyDescriptor.h
@@ -0,0 +1,36 @@
+// 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"
+#include "core/css/CSSValue.h"
+#include "core/css/properties/CSSPropertyAPI.h"
+
+namespace blink {
+
+/* This struct should contain function pointers matching those declared
+   in CSSPropertyAPI. API functions should also be added to the getDescriptor
+   template below. */
+struct CSSPropertyDescriptor {
+  const CSSValue* (*parseSingleValue)(CSSParserTokenRange&,
+                                      const CSSParserContext&);
+  CSSPropertyID (*getID)();
+
+  bool isValidProperty;

[nainar, 2016/11/29 02:17:21]

should this maybe be m_isValidProperty?

+  static const CSSPropertyDescriptor& get(CSSPropertyID);
+  static void add(CSSPropertyDescriptor, CSSPropertyID);
+};
+
+template <class T>
+CSSPropertyDescriptor getDescriptor() {
+  CSSPropertyDescriptor a;
+  a.parseSingleValue = &T::parseSingleValue;
+  a.getID = &T::getID;
+
+  DCHECK(a.parseSingleValue != CSSPropertyAPI::parseSingleValue);
+  DCHECK(a.getID != CSSPropertyAPI::getID);
+
+  a.isValidProperty = true;
+  return a;
+}
+}