diff -r 000000000000 -r 6474c204b198 layout/style/GroupRule.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/style/GroupRule.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,102 @@
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 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/. */
+
+/*
+ * internal interface representing CSS style rules that contain other
+ * rules, such as @media rules
+ */
+
+#ifndef mozilla_css_GroupRule_h__
+#define mozilla_css_GroupRule_h__
+
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+#include "mozilla/css/Rule.h"
+#include "nsCOMArray.h"
+#include "nsAutoPtr.h"
+#include "nsCycleCollectionParticipant.h"
+
+class nsPresContext;
+class nsMediaQueryResultCacheKey;
+
+namespace mozilla {
+namespace css {
+
+class GroupRuleRuleList;
+
+// inherits from Rule so it can be shared between
+// MediaRule and DocumentRule
+class GroupRule : public Rule
+{
+protected:
+  GroupRule();
+  GroupRule(const GroupRule& aCopy);
+  virtual ~GroupRule();
+public:
+
+  NS_DECL_CYCLE_COLLECTION_CLASS(GroupRule)
+  NS_DECL_CYCLE_COLLECTING_ISUPPORTS
+
+  // implement part of nsIStyleRule and Rule
+  DECL_STYLE_RULE_INHERIT_NO_DOMRULE
+  virtual void SetStyleSheet(nsCSSStyleSheet* aSheet);
+
+  // to help implement nsIStyleRule
+#ifdef DEBUG
+  virtual void List(FILE* out = stdout, int32_t aIndent = 0) const MOZ_OVERRIDE;
+#endif
+
+public:
+  void AppendStyleRule(Rule* aRule);
+
+  int32_t StyleRuleCount() const { return mRules.Count(); }
+  Rule* GetStyleRuleAt(int32_t aIndex) const;
+
+  typedef nsCOMArray<Rule>::nsCOMArrayEnumFunc RuleEnumFunc;
+  bool EnumerateRulesForwards(RuleEnumFunc aFunc, void * aData) const;
+
+  /*
+   * The next three methods should never be called unless you have first
+   * called WillDirty() on the parent stylesheet.  After they are
+   * called, DidDirty() needs to be called on the sheet.
+   */
+  nsresult DeleteStyleRuleAt(uint32_t aIndex);
+  nsresult InsertStyleRuleAt(uint32_t aIndex, Rule* aRule);
+  nsresult ReplaceStyleRule(Rule *aOld, Rule *aNew);
+
+  virtual bool UseForPresentation(nsPresContext* aPresContext,
+                                    nsMediaQueryResultCacheKey& aKey) = 0;
+
+  // non-virtual -- it is only called by subclasses
+  size_t SizeOfExcludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+  virtual size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const = 0;
+
+  static bool
+  CloneRuleInto(Rule* aRule, void* aArray)
+  {
+    nsRefPtr<Rule> clone = aRule->Clone();
+    static_cast<nsCOMArray<Rule>*>(aArray)->AppendObject(clone);
+    return true;
+  }
+
+protected:
+  // to help implement nsIDOMCSSRule
+  void AppendRulesToCssText(nsAString& aCssText);
+
+  // to implement common methods on nsIDOMCSSMediaRule and
+  // nsIDOMCSSMozDocumentRule
+  nsresult GetCssRules(nsIDOMCSSRuleList* *aRuleList);
+  nsresult InsertRule(const nsAString & aRule, uint32_t aIndex,
+                      uint32_t* _retval);
+  nsresult DeleteRule(uint32_t aIndex);
+
+  nsCOMArray<Rule> mRules;
+  nsRefPtr<GroupRuleRuleList> mRuleCollection; // lazily constructed
+};
+
+} // namespace css
+} // namespace mozilla
+
+#endif /* mozilla_css_GroupRule_h__ */