Rework the "rules for parsing dimension values" implementation

third_party/WebKit/Source/core/html/HTMLElement.h

Index: third_party/WebKit/Source/core/html/HTMLElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLElement.h b/third_party/WebKit/Source/core/html/HTMLElement.h
index 6a33cd0d4a711566417be6fbc6e53f4e14dd357a..9ad60ed559ed3b682f782e35b2d26e7db18a71bb 100644
--- a/third_party/WebKit/Source/core/html/HTMLElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLElement.h
@@ -122,9 +122,11 @@ class CORE_EXPORT HTMLElement : public Element {
  protected:
   HTMLElement(const QualifiedName& tagName, Document&, ConstructionType);
 
+  enum AllowPercentage { DontAllowPercentageValues, AllowPercentageValues };
   void addHTMLLengthToStyle(MutableStylePropertySet*,
                             CSSPropertyID,
-                            const String& value);
+                            const String& value,
+                            AllowPercentage = AllowPercentageValues);
   void addHTMLColorToStyle(MutableStylePropertySet*,
                            CSSPropertyID,
                            const String& color);