Add CSS parser recovery from errors while parsing @-webkit-keyframes key values.

Source/core/css/CSSParserValues.h

 /*
  * Copyright (C) 2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2008, 2009, 2010 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.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 98 matching lines @@
 struct CSSParserValue {
     int id;
     bool isInt;
     union {
         double fValue;
         int iValue;
         CSSParserString string;
         CSSParserFunction* function;
     };
     enum {
-        Operator = 0x100000,
-        Function = 0x100001,
-        Q_EMS    = 0x100002
+        Invalid  = 0x100000,

[hayato, 2013/04/17 08:22:56]

I am wondering why we need to set an explicit value to each enum value here. Is
there any code which checks CSSParserValue::unit using bit-wise operation?

Looks like we can remove explicit enum values here.

e.g.
enum {
  Invalid, Operator, Function, Q_EMS
};

+        Operator = 0x100001,
+        Function = 0x100002,
+        Q_EMS    = 0x100003
     };
     int unit;
 
 
     PassRefPtr<CSSValue> createCSSValue();
 };
 
 class CSSParserValueList {
     WTF_MAKE_FAST_ALLOCATED;
 public:
@@ skipping 79 matching lines @@
 };
 
 inline bool CSSParserSelector::hasShadowDescendant() const
 {
     return m_selector->relation() == CSSSelector::ShadowDescendant;
 }
 
 }
 
 #endif