Add parseFontFaceDescriptor for @font-face handling

Source/core/css/StyleRule.h

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * (C) 2002-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2008, 2012, 2013 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 26 matching lines @@
 
 class CORE_EXPORT StyleRuleBase : public RefCountedWillBeGarbageCollectedFinalized<StyleRuleBase> {
     WTF_MAKE_FAST_ALLOCATED_WILL_BE_REMOVED(StyleRuleBase);
 public:
     enum Type {
         Unknown,
         Charset,
         Style,
         Import,
         Media,
-        FontFace,
         Page,
         Keyframes,
         Keyframe,
         Namespace,
         Supports,
+        FontFace,
         Viewport,
     };
 
     Type type() const { return static_cast<Type>(m_type); }
 
     bool isCharsetRule() const { return type() == Charset; }
     bool isFontFaceRule() const { return type() == FontFace; }
     bool isKeyframesRule() const { return type() == Keyframes; }
     bool isKeyframeRule() const { return type() == Keyframe; }
     bool isNamespaceRule() const { return type() == Namespace; }
@@ skipping 71 matching lines @@
 
 class StyleRuleFontFace : public StyleRuleBase {
 public:
     static PassRefPtrWillBeRawPtr<StyleRuleFontFace> create() { return adoptRefWillBeNoop(new StyleRuleFontFace); }
 
     ~StyleRuleFontFace();
 
     const StylePropertySet& properties() const { return *m_properties; }
     MutableStylePropertySet& mutableProperties();
 
-    void setProperties(PassRefPtrWillBeRawPtr<StylePropertySet>);
+    bool setProperties(PassRefPtrWillBeRawPtr<StylePropertySet>);
 
     PassRefPtrWillBeRawPtr<StyleRuleFontFace> copy() const { return adoptRefWillBeNoop(new StyleRuleFontFace(*this)); }
 
     DECLARE_TRACE_AFTER_DISPATCH();
 
 private:
     StyleRuleFontFace();
     StyleRuleFontFace(const StyleRuleFontFace&);
 
     RefPtrWillBeMember<StylePropertySet> m_properties; // Cannot be null.
@@ skipping 124 matching lines @@
 DEFINE_STYLE_RULE_TYPE_CASTS(FontFace);
 DEFINE_STYLE_RULE_TYPE_CASTS(Page);
 DEFINE_STYLE_RULE_TYPE_CASTS(Media);
 DEFINE_STYLE_RULE_TYPE_CASTS(Supports);
 DEFINE_STYLE_RULE_TYPE_CASTS(Viewport);
 DEFINE_STYLE_RULE_TYPE_CASTS(Charset);
 
 } // namespace blink
 
 #endif // StyleRule_h