Recognise variable names when parsing CSS property names

third_party/WebKit/Source/core/css/cssom/CSSStyleValue.cpp

 // Copyright 2015 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/cssom/CSSStyleValue.h"
 
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/ScriptValue.h"
 #include "bindings/core/v8/ToV8.h"
 #include "core/StylePropertyShorthand.h"
 #include "core/css/cssom/StyleValueFactory.h"
 #include "core/css/parser/CSSParser.h"
 
 namespace blink {
 
 ScriptValue CSSStyleValue::parse(ScriptState* scriptState, const String& propertyName, const String& value, ExceptionState& exceptionState)
 {
     if (propertyName.isEmpty()) {
         exceptionState.throwTypeError("Property name cannot be empty");
         return ScriptValue::createNull(scriptState);
     }
 
     CSSPropertyID propertyID = cssPropertyID(propertyName);
-    if (propertyID == CSSPropertyInvalid) {
+    // TODO(timloh): Handle custom properties
+    if (propertyID == CSSPropertyInvalid || propertyID == CSSPropertyVariable) {
         exceptionState.throwTypeError("Invalid property name");
         return ScriptValue::createNull(scriptState);
     }
     if (isShorthandProperty(propertyID)) {
         exceptionState.throwTypeError("Parsing shorthand properties is not supported");
         return ScriptValue::createNull(scriptState);
     }
 
     const CSSValue* cssValue = CSSParser::parseSingleValue(propertyID, value, strictCSSParserContext());
     if (!cssValue)
         return ScriptValue::createNull(scriptState);
 
     CSSStyleValueVector styleValueVector = StyleValueFactory::cssValueToStyleValueVector(propertyID, *cssValue);
     if (styleValueVector.size() != 1) {
         // TODO(meade): Support returning a CSSStyleValueOrCSSStyleValueSequence
         // from this function.
         return ScriptValue::createNull(scriptState);
     }
 
     v8::Local<v8::Value> wrappedValue = toV8(styleValueVector[0], scriptState->context()->Global(), scriptState->isolate());
     return ScriptValue(scriptState, wrappedValue);
 }
 
 } // namespace blink