diff -r 000000000000 -r 6474c204b198 docshell/base/nsIDocumentLoaderFactory.idl
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/docshell/base/nsIDocumentLoaderFactory.idl	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,46 @@
+/* -*- Mode: IDL; tab-width: 4; 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/. */
+
+#include "nsISupports.idl"
+
+interface nsIChannel;
+interface nsIContentViewer;
+interface nsIStreamListener;
+interface nsIDocShell;
+interface nsIDocument;
+interface nsILoadGroup;
+interface nsIPrincipal;
+
+/**
+ * To get a component that implements nsIDocumentLoaderFactory
+ * for a given mimetype, use nsICategoryManager to find an entry
+ * with the mimetype as its name in the category "Gecko-Content-Viewers".
+ * The value of the entry is the contractid of the component.
+ * The component is a service, so use GetService, not CreateInstance to get it.
+ */
+
+[scriptable, uuid(70905274-8494-4e39-b011-d559adde3733)]
+interface nsIDocumentLoaderFactory : nsISupports {
+    nsIContentViewer createInstance(in string aCommand,
+                              in nsIChannel aChannel,
+                              in nsILoadGroup aLoadGroup,
+                              in string aContentType, 
+                              in nsIDocShell aContainer,
+                              in nsISupports aExtraInfo,
+                              out nsIStreamListener aDocListenerResult);
+
+    nsIContentViewer createInstanceForDocument(in nsISupports aContainer,
+                                         in nsIDocument aDocument,
+                                         in string aCommand);
+
+    /**
+     * Create a blank document using the given loadgroup and given
+     * principal.  aPrincipal is allowed to be null, in which case the
+     * new document will get the about:blank codebase principal.
+     */
+    nsIDocument createBlankDocument(in nsILoadGroup aLoadGroup,
+                                    in nsIPrincipal aPrincipal);
+};