diff -r 000000000000 -r 6474c204b198 layout/base/nsStyleSheetService.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/layout/base/nsStyleSheetService.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,71 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set ts=8 sts=2 et sw=2 tw=80: */
+/* 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/. */
+
+/* implementation of interface for managing user and user-agent style sheets */
+
+#ifndef nsStyleSheetService_h_
+#define nsStyleSheetService_h_
+
+#include "nsCOMArray.h"
+#include "nsCOMPtr.h"
+#include "nsIMemoryReporter.h"
+#include "nsIStyleSheetService.h"
+#include "mozilla/Attributes.h"
+#include "mozilla/MemoryReporting.h"
+
+class nsICategoryManager;
+class nsIMemoryReporter;
+class nsISimpleEnumerator;
+class nsIStyleSheet;
+
+#define NS_STYLESHEETSERVICE_CID \
+{0xfcca6f83, 0x9f7d, 0x44e4, {0xa7, 0x4b, 0xb5, 0x94, 0x33, 0xe6, 0xc8, 0xc3}}
+
+#define NS_STYLESHEETSERVICE_CONTRACTID \
+  "@mozilla.org/content/style-sheet-service;1"
+
+class nsStyleSheetService MOZ_FINAL
+  : public nsIStyleSheetService
+  , public nsIMemoryReporter
+{
+ public:
+  nsStyleSheetService() NS_HIDDEN;
+  ~nsStyleSheetService() NS_HIDDEN;
+
+  NS_DECL_ISUPPORTS
+  NS_DECL_NSISTYLESHEETSERVICE
+  NS_DECL_NSIMEMORYREPORTER
+
+  NS_HIDDEN_(nsresult) Init();
+
+  nsCOMArray<nsIStyleSheet>* AgentStyleSheets() { return &mSheets[AGENT_SHEET]; }
+  nsCOMArray<nsIStyleSheet>* UserStyleSheets() { return &mSheets[USER_SHEET]; }
+  nsCOMArray<nsIStyleSheet>* AuthorStyleSheets() { return &mSheets[AUTHOR_SHEET]; }
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf aMallocSizeOf) const;
+
+  static nsStyleSheetService *GetInstance();
+  static nsStyleSheetService *gInstance;
+
+ private:
+
+  NS_HIDDEN_(void) RegisterFromEnumerator(nsICategoryManager  *aManager,
+                                          const char          *aCategory,
+                                          nsISimpleEnumerator *aEnumerator,
+                                          uint32_t             aSheetType);
+
+  NS_HIDDEN_(int32_t) FindSheetByURI(const nsCOMArray<nsIStyleSheet> &sheets,
+                                     nsIURI *sheetURI);
+
+  // Like LoadAndRegisterSheet, but doesn't notify.  If successful, the
+  // new sheet will be the last sheet in mSheets[aSheetType].
+  NS_HIDDEN_(nsresult) LoadAndRegisterSheetInternal(nsIURI *aSheetURI,
+                                                    uint32_t aSheetType);
+
+  nsCOMArray<nsIStyleSheet> mSheets[3];
+};
+
+#endif