Current work-in-progress crbug.com/567021

third_party/WebKit/Source/core/css/RuleSet.h

Index: third_party/WebKit/Source/core/css/RuleSet.h
diff --git a/third_party/WebKit/Source/core/css/RuleSet.h b/third_party/WebKit/Source/core/css/RuleSet.h
index 9f310e0d7e6b004c1415db3a6372a01c27936d33..6350b795ebd089454e3ea1fb38c3244e8c3e8567 100644
--- a/third_party/WebKit/Source/core/css/RuleSet.h
+++ b/third_party/WebKit/Source/core/css/RuleSet.h
@@ -135,6 +135,7 @@ class CORE_EXPORT RuleSet : public GarbageCollectedFinalized<RuleSet> {
     WTF_MAKE_NONCOPYABLE(RuleSet);
 public:
     static RuleSet* create() { return new RuleSet; }
+    static RuleSet* emptyRuleSet();
 
     void addRulesFromSheet(StyleSheetContents*, const MediaQueryEvaluator&, AddRuleFlags = RuleHasNoSpecialState);
     void addStyleRule(StyleRule*, AddRuleFlags);
@@ -152,14 +153,11 @@ public:
     const HeapVector<RuleData>* universalRules() const { ASSERT(!m_pendingRules); return &m_universalRules; }
     const HeapVector<RuleData>* shadowHostRules() const { ASSERT(!m_pendingRules); return &m_shadowHostRules; }
     const HeapVector<Member<StyleRulePage>>& pageRules() const { ASSERT(!m_pendingRules); return m_pageRules; }
-    const HeapVector<Member<StyleRuleViewport>>& viewportRules() const { ASSERT(!m_pendingRules); return m_viewportRules; }
     const HeapVector<Member<StyleRuleFontFace>>& fontFaceRules() const { return m_fontFaceRules; }
     const HeapVector<Member<StyleRuleKeyframes>>& keyframesRules() const { return m_keyframesRules; }
     const HeapVector<MinimalRuleData>& deepCombinatorOrShadowPseudoRules() const { return m_deepCombinatorOrShadowPseudoRules; }
     const HeapVector<MinimalRuleData>& contentPseudoElementRules() const { return m_contentPseudoElementRules; }
     const HeapVector<MinimalRuleData>& slottedPseudoElementRules() const { return m_slottedPseudoElementRules; }
-    const MediaQueryResultList& viewportDependentMediaQueryResults() const { return m_viewportDependentMediaQueryResults; }
-    const MediaQueryResultList& deviceDependentMediaQueryResults() const { return m_deviceDependentMediaQueryResults; }
 
     unsigned ruleCount() const { return m_ruleCount; }
 
@@ -187,7 +185,6 @@ private:
 
     void addToRuleSet(const AtomicString& key, PendingRuleMap&, const RuleData&);
     void addPageRule(StyleRulePage*);
-    void addViewportRule(StyleRuleViewport*);
     void addFontFaceRule(StyleRuleFontFace*);
     void addKeyframesRule(StyleRuleKeyframes*);
 
@@ -230,16 +227,12 @@ private:
     HeapVector<RuleData> m_shadowHostRules;
     RuleFeatureSet m_features;
     HeapVector<Member<StyleRulePage>> m_pageRules;
-    HeapVector<Member<StyleRuleViewport>> m_viewportRules;
     HeapVector<Member<StyleRuleFontFace>> m_fontFaceRules;
     HeapVector<Member<StyleRuleKeyframes>> m_keyframesRules;
     HeapVector<MinimalRuleData> m_deepCombinatorOrShadowPseudoRules;
     HeapVector<MinimalRuleData> m_contentPseudoElementRules;
     HeapVector<MinimalRuleData> m_slottedPseudoElementRules;
 
-    MediaQueryResultList m_viewportDependentMediaQueryResults;
-    MediaQueryResultList m_deviceDependentMediaQueryResults;
-
     unsigned m_ruleCount;
     Member<PendingRuleMaps> m_pendingRules;