Cascade declared property values instead of applying values on top of each other

Source/core/css/resolver/CascadedValues.h

Index: Source/core/css/resolver/CascadedValues.h
diff --git a/Source/core/css/resolver/CascadedValues.h b/Source/core/css/resolver/CascadedValues.h
new file mode 100644
index 0000000000000000000000000000000000000000..e0b2588ea16adac7acd2a7971d118ca4085050c7
--- /dev/null
+++ b/Source/core/css/resolver/CascadedValues.h
@@ -0,0 +1,53 @@
+// 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 CascadedValues_h
+#define CascadedValues_h
+
+#include "core/CSSPropertyNames.h"
+#include "core/css/RuleSet.h"
+#include "core/css/SelectorChecker.h"
+#include "core/rendering/style/RenderStyleConstants.h"
+#include "platform/text/TextDirection.h"
+#include "platform/text/WritingMode.h"
+
+namespace blink {
+
+class CSSValue;
+class MatchResult;
+class StyleResolverState;
+class StyleRule;
+
+class CascadedValues {
+    STACK_ALLOCATED();
+public:
+    CascadedValues(StyleResolverState&, const MatchResult&, bool onlyAddUARules = false);
+    void applyValues(CSSPropertyID first, CSSPropertyID last, bool inheritedOnly = false);
+
+private:
+    void addMatchResult(const MatchResult&, CSSPropertyID firstId, CSSPropertyID lastId);
+    void addMatchResultRange(const MatchResult&, bool isImportant, int firstIndex, int lastIndex, CSSPropertyID firstId, CSSPropertyID lastId);
+    void addStylePropertySet(const StylePropertySet*, const StyleRule*, bool isImportant, CSSPropertyID first, CSSPropertyID last, PropertyWhitelistType, SelectorChecker::LinkMatchMask);
+    void addValue(CSSPropertyID, CSSValue*, const StyleRule*, SelectorChecker::LinkMatchMask);
+    void addAllProperty(CSSValue*, SelectorChecker::LinkMatchMask);
+
+    CSSValue* cascadedValue(CSSPropertyID id) { return m_values[id - firstCSSProperty]; }
+    CSSValue* cascadedVisitedLinkValue(CSSPropertyID id) { return m_visitedLinkValues[id - firstCSSProperty]; }
+    void setCascadedValue(CSSPropertyID, CSSValue*);
+    void setCascadedVisitedLinkValue(CSSPropertyID, CSSValue*);
+    void clearCascadedValue(CSSPropertyID id) { setCascadedValue(id, nullptr); }
+
+    CSSValue* m_values[numCSSProperties];
+    CSSValue* m_visitedLinkValues[numCSSProperties];
+    Vector<CSSPropertyID, 32> setProperties;
+    Vector<CSSPropertyID, 32> setVisitedProperties;
+
+    StyleResolverState& m_state;
+    TextDirection m_direction;
+    WritingMode m_writingMode;
+};
+
+} // namespace blink
+
+#endif // CascadedValues_h