Restructure type tracking in StyleValues to work better with new numeric types

third_party/WebKit/Source/core/css/cssom/CSSStyleValue.h

 // Copyright 2015 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 CSSStyleValue_h
 #define CSSStyleValue_h
 
 #include "core/CSSPropertyNames.h"
 #include "core/CoreExport.h"
 #include "core/css/CSSValue.h"
 #include "platform/bindings/ScriptWrappable.h"
 #include "platform/wtf/text/WTFString.h"
 
 namespace blink {
 
 class ExceptionState;
 class ScriptState;
 class ScriptValue;
 
 // The base class for all CSS values returned by the Typed OM.
 // See CSSStyleValue.idl for additional documentation about this class.
 class CORE_EXPORT CSSStyleValue
     : public GarbageCollectedFinalized<CSSStyleValue>,
       public ScriptWrappable {
   WTF_MAKE_NONCOPYABLE(CSSStyleValue);
   DEFINE_WRAPPERTYPEINFO();
 
  public:
   enum StyleValueType {
-    // This list corresponds to each non-abstract subclass.
-    kUnknown,
+    kUnknownType,
     kAngleType,
-    kCalcLengthType,
+    kFlexType,
+    kFrequencyType,
     kKeywordType,
+    kLengthType,
     kNumberType,
+    kPercentType,
     kPositionType,
-    kSimpleLengthType,
+    kResolutionType,
+    kTimeType,
     kTransformType,
-    kUnitType,
     kUnparsedType,
     kURLImageType,
+    kInvalidType,
   };
 
-  virtual ~CSSStyleValue() {}
-
-  virtual StyleValueType GetType() const = 0;
-
   static ScriptValue parse(ScriptState*,
                            const String& property_name,
                            const String& value,
                            ExceptionState&);
 
+  virtual ~CSSStyleValue() {}
+
+  virtual StyleValueType GetType() const = 0;
+  virtual bool ContainsPercent() const { return false; }
+
   virtual const CSSValue* ToCSSValue() const = 0;
   virtual const CSSValue* ToCSSValueWithProperty(CSSPropertyID) const {
     return ToCSSValue();
   }
   virtual String toString() const {
     const CSSValue* result = ToCSSValue();
     // TODO(meade): Remove this once all the number and length types are
     // rewritten.
     return result ? result->CssText() : "";
   }
 
   DEFINE_INLINE_VIRTUAL_TRACE() {}
 
  protected:
+  static String StyleValueTypeToString(StyleValueType);
+
   CSSStyleValue() {}
 };
 
 typedef HeapVector<Member<CSSStyleValue>> CSSStyleValueVector;
 
 }  // namespace blink
 
 #endif