Added CSSPropertyShapeUtils which holds shape parsing methods.

third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp

Index: third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp
diff --git a/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp b/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp
index 4b438c255c3c38532d465dcd251db3d9ab353d5b..54474fc6f94ef504e06602acf98d95b06ccdba7c 100644
--- a/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp
+++ b/third_party/WebKit/Source/core/css/parser/CSSPropertyParserHelpers.cpp
@@ -23,6 +23,17 @@ namespace blink {
 
 namespace CSSPropertyParserHelpers {
 
+void complete4Sides(CSSValue* side[4]) {
+  if (side[3])
+    return;
+  if (!side[2]) {
+    if (!side[1])
+      side[1] = side[0];
+    side[2] = side[0];
+  }
+  side[3] = side[1];
+}
+
 bool consumeCommaIncludingWhitespace(CSSParserTokenRange& range) {
   CSSParserToken value = range.peek();
   if (value.type() != CommaToken)