Add parseFontFaceDescriptor for @font-face handling

Source/core/css/parser/BisonCSSParser-in.cpp

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Nicholas Shanks <webkit@nickshanks.com>
  * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (C) 2012 Adobe Systems Incorporated. All rights reserved.
  * Copyright (C) 2012 Intel Corporation. All rights reserved.
  *
@@ skipping 708 matching lines @@
         m_parsedRules.append(rule.release());
         CSSSelectorParser::recordSelectorStats(m_context, result->selectorList());
     }
     clearProperties();
     return result;
 }
 
 StyleRuleBase* BisonCSSParser::createFontFaceRule()
 {
     m_allowImportRules = m_allowNamespaceDeclarations = false;
-    for (unsigned i = 0; i < m_parsedProperties.size(); ++i) {
-        CSSProperty& property = m_parsedProperties[i];
-        if (property.id() == CSSPropertyFontFamily && (!property.value()->isValueList() || toCSSValueList(property.value())->length() != 1)) {
-            // Unlike font-family property, font-family descriptor in @font-face rule
-            // has to be a value list with exactly one family name. It cannot have a
-            // have 'initial' value and cannot 'inherit' from parent.
-            // See http://dev.w3.org/csswg/css3-fonts/#font-family-desc
-            clearProperties();
-            return 0;
-        }
+    RefPtrWillBeRawPtr<StyleRuleFontFace> rule = StyleRuleFontFace::create();
+    if (!rule->setProperties(createStylePropertySet())) {
+        clearProperties();
+        return nullptr;
     }
-    RefPtrWillBeRawPtr<StyleRuleFontFace> rule = StyleRuleFontFace::create();
-    rule->setProperties(createStylePropertySet());
     clearProperties();
     StyleRuleFontFace* result = rule.get();
     m_parsedRules.append(rule.release());
     if (m_styleSheet)
         m_styleSheet->setHasFontFaceRule(true);
     return result;
 }
 
 void BisonCSSParser::addNamespace(const AtomicString& prefix, const AtomicString& uri)
 {
@@ skipping 260 matching lines @@
     rule->setProperties(createStylePropertySet());
     clearProperties();
 
     StyleRuleViewport* result = rule.get();
     m_parsedRules.append(rule.release());
 
     return result;
 }
 
 }