[wip] simplify -webkit-appearance adjust step

Source/core/css/resolver/CascadedValues.cpp

Index: Source/core/css/resolver/CascadedValues.cpp
diff --git a/Source/core/css/resolver/CascadedValues.cpp b/Source/core/css/resolver/CascadedValues.cpp
index 4520141312d2bd5df34fde80105617c69bb9abcc..c3cecc069f1174805ba18e65bd5cac3e217255cd 100644
--- a/Source/core/css/resolver/CascadedValues.cpp
+++ b/Source/core/css/resolver/CascadedValues.cpp
@@ -244,7 +244,7 @@ static CSSPropertyID resolveProperty(CSSPropertyID property, TextDirection direc
     }
 }
 
-CascadedValues::CascadedValues(StyleResolverState& state, const MatchResult& matchResult, bool onlyAddUARules)
+CascadedValues::CascadedValues(StyleResolverState& state, const MatchResult& matchResult)
     : m_state(state)
 {
     memset(m_values, 0, sizeof(m_values));
@@ -258,11 +258,17 @@ CascadedValues::CascadedValues(StyleResolverState& state, const MatchResult& mat
     m_writingMode = state.style()->writingMode();
 
     COMPILE_ASSERT(CSSPropertyColor == CSSPropertyWebkitWritingMode + 1, CSS_color_is_after_super_high_priority);
-    if (onlyAddUARules) {
-        addMatchResultRange(matchResult, false, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, CSSPropertyColor, convertToCSSPropertyID(lastCSSProperty));
-    } else {
-        addMatchResult(matchResult, CSSPropertyColor, convertToCSSPropertyID(lastCSSProperty));
-    }
+    addMatchResult(matchResult, CSSPropertyColor, convertToCSSPropertyID(lastCSSProperty));
+}
+
+CascadedValues::CascadedValues(StyleResolverState& state, const MatchResult& matchResult, WebkitAppearanceConstructorType)
+    : m_state(state)
+{
+    memset(m_values, 0, sizeof(m_values));
+    memset(m_visitedLinkValues, 0, sizeof(m_visitedLinkValues));
+    m_direction = state.style()->direction();
+    m_writingMode = state.style()->writingMode();
+    addMatchResultRange(matchResult, false, matchResult.ranges.firstUARule, matchResult.ranges.lastUARule, CSSPropertyColor, convertToCSSPropertyID(lastCSSProperty));
 }
 
 void CascadedValues::addMatchResult(const MatchResult& matchResult, CSSPropertyID firstId, CSSPropertyID lastId)
@@ -388,4 +394,28 @@ void CascadedValues::applyValues(CSSPropertyID first, CSSPropertyID last, bool i
     }
 }
 
+bool CascadedValues::valuesUnchangedForWebkitAppearance(const MatchResult& matchResult)
+{
+    static const CSSPropertyID propertiesToCompare[] = {
+        CSSPropertyBorderBottomColor, CSSPropertyBorderBottomStyle, CSSPropertyBorderBottomWidth,
+        CSSPropertyBorderLeftColor, CSSPropertyBorderLeftStyle, CSSPropertyBorderLeftWidth,
+        CSSPropertyBorderRightColor, CSSPropertyBorderRightStyle, CSSPropertyBorderRightWidth,
+        CSSPropertyBorderTopColor, CSSPropertyBorderTopStyle, CSSPropertyBorderTopWidth,
+        CSSPropertyBorderBottomLeftRadius, CSSPropertyBorderBottomRightRadius,
+        CSSPropertyBorderTopLeftRadius, CSSPropertyBorderTopRightRadius,
+        CSSPropertyBorderImageOutset, CSSPropertyBorderImageRepeat, CSSPropertyBorderImageSlice,
+        CSSPropertyBorderImageSource, CSSPropertyBorderImageWidth,
+        CSSPropertyBackgroundAttachment, CSSPropertyBackgroundBlendMode, CSSPropertyBackgroundClip,
+        CSSPropertyBackgroundColor, CSSPropertyBackgroundImage, CSSPropertyBackgroundOrigin,
+        CSSPropertyBackgroundPositionX, CSSPropertyBackgroundPositionY, CSSPropertyBackgroundSize,
+    };
+    CascadedValues uaValues(m_state, matchResult, WebkitAppearanceConstructor);
+    for (size_t i = 0; i < WTF_ARRAY_LENGTH(propertiesToCompare); ++i) {
+        CSSPropertyID property = propertiesToCompare[i];
+        if (cascadedValue(property) != uaValues.cascadedValue(property))
+            return false;
+    }
+    return true;
+}
+
 } // namespace blink