diff -r 000000000000 -r 6474c204b198 content/base/public/nsIStyleSheetLinkingElement.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/content/base/public/nsIStyleSheetLinkingElement.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,101 @@
+/* -*- 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/. */
+#ifndef nsIStyleSheetLinkingElement_h__
+#define nsIStyleSheetLinkingElement_h__
+
+
+#include "nsISupports.h"
+
+class nsICSSLoaderObserver;
+class nsIURI;
+
+#define NS_ISTYLESHEETLINKINGELEMENT_IID          \
+{ 0xd753c84a, 0x17fd, 0x4d5f, \
+ { 0xb2, 0xe9, 0x63, 0x52, 0x8c, 0x87, 0x99, 0x7a } }
+
+class nsIStyleSheet;
+class nsCSSStyleSheet;
+
+class nsIStyleSheetLinkingElement : public nsISupports {
+public:
+  NS_DECLARE_STATIC_IID_ACCESSOR(NS_ISTYLESHEETLINKINGELEMENT_IID)
+
+  /**
+   * Used to make the association between a style sheet and
+   * the element that linked it to the document.
+   *
+   * @param aStyleSheet the style sheet associated with this
+   *                    element.
+   */
+  NS_IMETHOD SetStyleSheet(nsCSSStyleSheet* aStyleSheet) = 0;
+
+  /**
+   * Used to obtain the style sheet linked in by this element.
+   *
+   * @param aStyleSheet out parameter that returns the style
+   *                    sheet associated with this element.
+   */
+  NS_IMETHOD GetStyleSheet(nsIStyleSheet*& aStyleSheet) = 0;
+
+  /**
+   * Initialize the stylesheet linking element. If aDontLoadStyle is
+   * true the element will ignore the first modification to the
+   * element that would cause a stylesheet to be loaded. Subsequent
+   * modifications to the element will not be ignored.
+   */
+  NS_IMETHOD InitStyleLinkElement(bool aDontLoadStyle) = 0;
+
+  /**
+   * Tells this element to update the stylesheet.
+   *
+   * @param aObserver    observer to notify once the stylesheet is loaded.
+   *                     This will be passed to the CSSLoader
+   * @param [out] aWillNotify whether aObserver will be notified when the sheet
+   *                          loads.  If this is false, then either we didn't
+   *                          start the sheet load at all, the load failed, or
+   *                          this was an inline sheet that completely finished
+   *                          loading.  In the case when the load failed the
+   *                          failure code will be returned.
+   * @param [out] whether the sheet is an alternate sheet.  This value is only
+   *              meaningful if aWillNotify is true.
+   */
+  NS_IMETHOD UpdateStyleSheet(nsICSSLoaderObserver* aObserver,
+                              bool *aWillNotify,
+                              bool *aIsAlternate) = 0;
+
+  /**
+   * Tells this element whether to update the stylesheet when the
+   * element's properties change.
+   *
+   * @param aEnableUpdates update on changes or not.
+   */
+  NS_IMETHOD SetEnableUpdates(bool aEnableUpdates) = 0;
+
+  /**
+   * Gets the charset that the element claims the style sheet is in
+   *
+   * @param aCharset the charset
+   */
+  NS_IMETHOD GetCharset(nsAString& aCharset) = 0;
+
+  /**
+   * Tells this element to use a different base URI. This is used for
+   * proper loading of xml-stylesheet processing instructions in XUL overlays
+   * and is only currently used by nsXMLStylesheetPI.
+   *
+   * @param aNewBaseURI the new base URI, nullptr to use the default base URI.
+   */
+  virtual void OverrideBaseURI(nsIURI* aNewBaseURI) = 0;
+
+  // This doesn't entirely belong here since they only make sense for
+  // some types of linking elements, but it's a better place than
+  // anywhere else.
+  virtual void SetLineNumber(uint32_t aLineNumber) = 0;
+};
+
+NS_DEFINE_STATIC_IID_ACCESSOR(nsIStyleSheetLinkingElement,
+                              NS_ISTYLESHEETLINKINGELEMENT_IID)
+
+#endif // nsILinkingElement_h__