Add parseFontFaceDescriptor for @font-face handling

Source/core/css/StyleRule.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2005, 2006, 2008, 2012 Apple Inc. 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 11 matching lines @@
 #include "config.h"
 #include "core/css/StyleRule.h"
 
 #include "core/css/CSSFontFaceRule.h"
 #include "core/css/CSSImportRule.h"
 #include "core/css/CSSKeyframesRule.h"
 #include "core/css/CSSMediaRule.h"
 #include "core/css/CSSPageRule.h"
 #include "core/css/CSSStyleRule.h"
 #include "core/css/CSSSupportsRule.h"
+#include "core/css/CSSValueList.h"
 #include "core/css/CSSViewportRule.h"
 #include "core/css/StylePropertySet.h"
 #include "core/css/StyleRuleImport.h"
 #include "core/css/StyleRuleKeyframe.h"
 #include "core/css/StyleRuleNamespace.h"
 
 namespace blink {
 
 struct SameSizeAsStyleRuleBase : public RefCountedWillBeGarbageCollectedFinalized<SameSizeAsStyleRuleBase> {
     unsigned bitfields;
@@ skipping 298 matching lines @@
 {
 }
 
 MutableStylePropertySet& StyleRuleFontFace::mutableProperties()
 {
     if (!m_properties->isMutable())
         m_properties = m_properties->mutableCopy();
     return *toMutableStylePropertySet(m_properties);
 }
 
-void StyleRuleFontFace::setProperties(PassRefPtrWillBeRawPtr<StylePropertySet> properties)
+bool StyleRuleFontFace::setProperties(PassRefPtrWillBeRawPtr<StylePropertySet> properties)
 {
+    // FIXME: This logic should be in CSSPropertyParser
+    // FIXME: Shouldn't we fail if font-family or src aren't specified?
+    for (unsigned i = 0; i < properties->propertyCount(); ++i) {
+        StylePropertySet::PropertyReference property = properties->propertyAt(i);
+        if (property.id() == CSSPropertyFontFamily && (!property.value()->isValueList() || toCSSValueList(property.value())->length() != 1))
+            return false;
+    }
+
     m_properties = properties;
+    return true;
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleFontFace)
 {
     visitor->trace(m_properties);
     StyleRuleBase::traceAfterDispatch(visitor);
 }
 
 StyleRuleGroup::StyleRuleGroup(Type type, WillBeHeapVector<RefPtrWillBeMember<StyleRuleBase>>& adoptRule)
     : StyleRuleBase(type)
@@ skipping 85 matching lines @@
     m_properties = properties;
 }
 
 DEFINE_TRACE_AFTER_DISPATCH(StyleRuleViewport)
 {
     visitor->trace(m_properties);
     StyleRuleBase::traceAfterDispatch(visitor);
 }
 
 } // namespace blink