Revert of Revert of Split out CSSParser public API

Source/core/animation/AnimationHelpers.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef AnimationHelpers_h
 #define AnimationHelpers_h
 
-#include "core/css/parser/BisonCSSParser.h"
+#include "core/css/parser/CSSParser.h"
 #include "wtf/text/StringBuilder.h"
 
 namespace blink {
 
 static inline CSSPropertyID camelCaseCSSPropertyNameToID(const String& propertyName)
 {
     if (propertyName.find('-') != kNotFound)
         return CSSPropertyInvalid;
 
     StringBuilder builder;
     size_t position = 0;
     size_t end;
     while ((end = propertyName.find(isASCIIUpper, position)) != kNotFound) {
         builder.append(propertyName.substring(position, end - position) + "-" + toASCIILower((propertyName)[end]));
         position = end + 1;
     }
     builder.append(propertyName.substring(position));
     // Doesn't handle prefixed properties.
     CSSPropertyID id = cssPropertyID(builder.toString());
     return id;
 }
 
 } // namespace blink
 
 #endif // AnimationHelpers_h