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diff --git a/layout/style/nsCSSRuleProcessor.h b/layout/style/nsCSSRuleProcessor.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+// vim:cindent:tabstop=2:expandtab:shiftwidth=2:
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+/*
+ * style rule processor for CSS style sheets, responsible for selector
+ * matching and cascading
+ */
+
+#ifndef nsCSSRuleProcessor_h_
+#define nsCSSRuleProcessor_h_
+
+#include "mozilla/Attributes.h"
+#include "mozilla/EventStates.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/RefCountType.h"
+#include "mozilla/SheetType.h"
+#include "mozilla/UniquePtr.h"
+#include "nsExpirationTracker.h"
+#include "nsIMediaList.h"
+#include "nsIStyleRuleProcessor.h"
+#include "nsRuleWalker.h"
+#include "nsTArray.h"
+
+struct CascadeEnumData;
+struct ElementDependentRuleProcessorData;
+struct nsCSSSelector;
+struct nsCSSSelectorList;
+struct nsFontFaceRuleContainer;
+struct RuleCascadeData;
+struct TreeMatchContext;
+class nsCSSKeyframesRule;
+class nsCSSPageRule;
+class nsCSSFontFeatureValuesRule;
+class nsCSSCounterStyleRule;
+
+namespace mozilla {
+class CSSStyleSheet;
+enum class CSSPseudoElementType : uint8_t;
+namespace css {
+class DocumentRule;
+} // namespace css
+} // namespace mozilla
+
+/**
+ * The CSS style rule processor provides a mechanism for sibling style
+ * sheets to combine their rule processing in order to allow proper
+ * cascading to happen.
+ *
+ * CSS style rule processors keep a live reference on all style sheets
+ * bound to them.  The CSS style sheets keep a weak reference to all the
+ * processors that they are bound to (many to many).  The CSS style sheet
+ * is told when the rule processor is going away (via DropRuleProcessor).
+ */
+
+class nsCSSRuleProcessor: public nsIStyleRuleProcessor {
+public:
+  typedef nsTArray<RefPtr<mozilla::CSSStyleSheet>> sheet_array_type;
+
+  // aScopeElement must be non-null iff aSheetType is
+  // SheetType::ScopedDoc.
+  // aPreviousCSSRuleProcessor is the rule processor (if any) that this
+  // one is replacing.
+  nsCSSRuleProcessor(const sheet_array_type& aSheets,
+                     mozilla::SheetType aSheetType,
+                     mozilla::dom::Element* aScopeElement,
+                     nsCSSRuleProcessor* aPreviousCSSRuleProcessor,
+                     bool aIsShared = false);
+  nsCSSRuleProcessor(sheet_array_type&& aSheets,
+                     mozilla::SheetType aSheetType,
+                     mozilla::dom::Element* aScopeElement,
+                     nsCSSRuleProcessor* aPreviousCSSRuleProcessor,
+                     bool aIsShared = false);
+
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+  NS_DECL_CYCLE_COLLECTION_CLASS(nsCSSRuleProcessor)
+
+public:
+  nsresult ClearRuleCascades();
+
+  static void Startup();
+  static void Shutdown();
+  static void FreeSystemMetrics();
+  static bool HasSystemMetric(nsIAtom* aMetric);
+
+  /*
+   * Returns true if the given aElement matches one of the
+   * selectors in aSelectorList.  Note that this method will assume
+   * the given aElement is not a relevant link.  aSelectorList must not
+   * include any pseudo-element selectors.  aSelectorList is allowed
+   * to be null; in this case false will be returned.
+   */
+  static bool SelectorListMatches(mozilla::dom::Element* aElement,
+                                    TreeMatchContext& aTreeMatchContext,
+                                    nsCSSSelectorList* aSelectorList);
+
+  /*
+   * Helper to get the content state for a content node.  This may be
+   * slightly adjusted from IntrinsicState().
+   */
+  static mozilla::EventStates GetContentState(
+                                mozilla::dom::Element* aElement,
+                                const TreeMatchContext& aTreeMatchContext);
+
+  /*
+   * Helper to get the content state for :visited handling for an element
+   */
+  static mozilla::EventStates GetContentStateForVisitedHandling(
+             mozilla::dom::Element* aElement,
+             const TreeMatchContext& aTreeMatchContext,
+             nsRuleWalker::VisitedHandlingType aVisitedHandling,
+             bool aIsRelevantLink);
+
+  /*
+   * Helper to test whether a node is a link
+   */
+  static bool IsLink(const mozilla::dom::Element* aElement);
+
+  /**
+   * Returns true if the given aElement matches aSelector.
+   * Like nsCSSRuleProcessor.cpp's SelectorMatches (and unlike
+   * SelectorMatchesTree), this does not check an entire selector list
+   * separated by combinators.
+   *
+   * :visited and :link will match both visited and non-visited links,
+   * as if aTreeMatchContext->mVisitedHandling were eLinksVisitedOrUnvisited.
+   *
+   * aSelector is restricted to not containing pseudo-elements.
+   */
+  static bool RestrictedSelectorMatches(mozilla::dom::Element* aElement,
+                                        nsCSSSelector* aSelector,
+                                        TreeMatchContext& aTreeMatchContext);
+
+  // nsIStyleRuleProcessor
+  virtual void RulesMatching(ElementRuleProcessorData* aData) override;
+
+  virtual void RulesMatching(PseudoElementRuleProcessorData* aData) override;
+
+  virtual void RulesMatching(AnonBoxRuleProcessorData* aData) override;
+
+#ifdef MOZ_XUL
+  virtual void RulesMatching(XULTreeRuleProcessorData* aData) override;
+#endif
+
+  virtual nsRestyleHint HasStateDependentStyle(StateRuleProcessorData* aData) override;
+  virtual nsRestyleHint HasStateDependentStyle(PseudoElementStateRuleProcessorData* aData) override;
+
+  virtual bool HasDocumentStateDependentStyle(StateRuleProcessorData* aData) override;
+
+  virtual nsRestyleHint
+    HasAttributeDependentStyle(AttributeRuleProcessorData* aData,
+                               mozilla::RestyleHintData& aRestyleHintDataResult)
+                                 override;
+
+  virtual bool MediumFeaturesChanged(nsPresContext* aPresContext) override;
+
+  /**
+   * If this rule processor currently has a substantive media query
+   * result cache key, return a copy of it.
+   */
+  mozilla::UniquePtr<nsMediaQueryResultCacheKey> CloneMQCacheKey();
+
+  virtual size_t SizeOfExcludingThis(mozilla::MallocSizeOf mallocSizeOf)
+    const MOZ_MUST_OVERRIDE override;
+  virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf)
+    const MOZ_MUST_OVERRIDE override;
+
+  // Append all the currently-active font face rules to aArray.  Return
+  // true for success and false for failure.
+  bool AppendFontFaceRules(nsPresContext* aPresContext,
+                           nsTArray<nsFontFaceRuleContainer>& aArray);
+
+  nsCSSKeyframesRule* KeyframesRuleForName(nsPresContext* aPresContext,
+                                           const nsString& aName);
+
+  nsCSSCounterStyleRule* CounterStyleRuleForName(nsPresContext* aPresContext,
+                                                 const nsAString& aName);
+
+  bool AppendPageRules(nsPresContext* aPresContext,
+                       nsTArray<nsCSSPageRule*>& aArray);
+
+  bool AppendFontFeatureValuesRules(nsPresContext* aPresContext,
+                              nsTArray<nsCSSFontFeatureValuesRule*>& aArray);
+
+  /**
+   * Returns the scope element for the scoped style sheets this rule
+   * processor is for.  If this is not a rule processor for scoped style
+   * sheets, it returns null.
+   */
+  mozilla::dom::Element* GetScopeElement() const { return mScopeElement; }
+
+  void TakeDocumentRulesAndCacheKey(
+      nsPresContext* aPresContext,
+      nsTArray<mozilla::css::DocumentRule*>& aDocumentRules,
+      nsDocumentRuleResultCacheKey& aDocumentRuleResultCacheKey);
+
+  bool IsShared() const { return mIsShared; }
+
+  nsExpirationState* GetExpirationState() { return &mExpirationState; }
+  void AddStyleSetRef();
+  void ReleaseStyleSetRef();
+  void SetInRuleProcessorCache(bool aVal) {
+    MOZ_ASSERT(mIsShared);
+    mInRuleProcessorCache = aVal;
+  }
+  bool IsInRuleProcessorCache() const { return mInRuleProcessorCache; }
+  bool IsUsedByMultipleStyleSets() const { return mStyleSetRefCnt > 1; }
+
+#ifdef XP_WIN
+  // Cached theme identifier for the moz-windows-theme media query.
+  static uint8_t GetWindowsThemeIdentifier();
+  static void SetWindowsThemeIdentifier(uint8_t aId) { 
+    sWinThemeId = aId;
+  }
+#endif
+
+  struct StateSelector {
+    StateSelector(mozilla::EventStates aStates, nsCSSSelector* aSelector)
+      : mStates(aStates),
+        mSelector(aSelector)
+    {}
+
+    mozilla::EventStates mStates;
+    nsCSSSelector* mSelector;
+  };
+
+protected:
+  virtual ~nsCSSRuleProcessor();
+
+private:
+  static bool CascadeSheet(mozilla::CSSStyleSheet* aSheet,
+                           CascadeEnumData* aData);
+
+  RuleCascadeData* GetRuleCascade(nsPresContext* aPresContext);
+  void RefreshRuleCascade(nsPresContext* aPresContext);
+
+  nsRestyleHint HasStateDependentStyle(ElementDependentRuleProcessorData* aData,
+                                       mozilla::dom::Element* aStatefulElement,
+                                       mozilla::CSSPseudoElementType aPseudoType,
+                                       mozilla::EventStates aStateMask);
+
+  void ClearSheets();
+
+  // The sheet order here is the same as in nsStyleSet::mSheets
+  sheet_array_type mSheets;
+
+  // active first, then cached (most recent first)
+  RuleCascadeData* mRuleCascades;
+
+  // If we cleared our mRuleCascades or replaced a previous rule
+  // processor, this is the media query result cache key that was used
+  // before we lost the old rule cascades.
+  mozilla::UniquePtr<nsMediaQueryResultCacheKey> mPreviousCacheKey;
+
+  // The last pres context for which GetRuleCascades was called.
+  nsPresContext *mLastPresContext;
+
+  // The scope element for this rule processor's scoped style sheets.
+  // Only used if mSheetType == nsStyleSet::eScopedDocSheet.
+  RefPtr<mozilla::dom::Element> mScopeElement;
+
+  nsTArray<mozilla::css::DocumentRule*> mDocumentRules;
+  nsDocumentRuleResultCacheKey mDocumentCacheKey;
+
+  nsExpirationState mExpirationState;
+  MozRefCountType mStyleSetRefCnt;
+
+  // type of stylesheet using this processor
+  mozilla::SheetType mSheetType;
+
+  const bool mIsShared;
+
+  // Whether we need to build up mDocumentCacheKey and mDocumentRules as
+  // we build a RuleCascadeData.  Is true only for shared rule processors
+  // and only before we build the first RuleCascadeData.  See comment in
+  // RefreshRuleCascade for why.
+  bool mMustGatherDocumentRules;
+
+  bool mInRuleProcessorCache;
+
+#ifdef DEBUG
+  bool mDocumentRulesAndCacheKeyValid;
+#endif
+
+#ifdef XP_WIN
+  static uint8_t sWinThemeId;
+#endif
+};
+
+#endif /* nsCSSRuleProcessor_h_ */