Fix serialization of css-wide keywords in custom properties

third_party/WebKit/Source/core/css/StylePropertySerializer.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2011 Research In Motion Limited. All rights reserved.
  * Copyright (C) 2013 Intel Corporation. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 166 matching lines @@
 
 String StylePropertySerializer::getCustomPropertyText(const PropertyValueForSerializer& property, bool isNotFirstDecl) const
 {
     ASSERT(property.id() == CSSPropertyVariable);
     StringBuilder result;
     if (isNotFirstDecl)
         result.append(' ');
     const CSSCustomPropertyDeclaration* value = toCSSCustomPropertyDeclaration(property.value());
     result.append(value->name());
     result.append(':');
+    if (!value->value())
+        result.append(' ');
     result.append(value->customCSSText());
     if (property.isImportant())
         result.append(" !important");
     result.append(';');
     return result.toString();
 }
 
 static String getApplyAtRuleText(const CSSValue* value, bool isNotFirstDecl)
 {
     StringBuilder result;
@@ skipping 691 matching lines @@
             builder.append(", ");
 
         const CSSValue& xValue = repeatXList ? repeatXList->item(i % repeatXList->length()) : repeatX;
         const CSSValue& yValue = repeatYList ? repeatYList->item(i % repeatYList->length()) : repeatY;
         appendBackgroundRepeatValue(builder, xValue, yValue);
     }
     return builder.toString();
 }
 
 } // namespace blink