diff -r 000000000000 -r 6474c204b198 caps/include/nsJSPrincipals.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/caps/include/nsJSPrincipals.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,56 @@
+/* -*- 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/. */
+/* describes principals by their orginating uris*/
+
+#ifndef nsJSPrincipals_h__
+#define nsJSPrincipals_h__
+#include "jsapi.h"
+#include "nsIPrincipal.h"
+
+class nsCString;
+
+struct nsJSPrincipals : nsIPrincipal, JSPrincipals
+{
+  static bool Subsume(JSPrincipals *jsprin, JSPrincipals *other);
+  static void Destroy(JSPrincipals *jsprin);
+
+  /*
+   * Get a weak reference to nsIPrincipal associated with the given JS
+   * principal.
+   */
+  static nsJSPrincipals* get(JSPrincipals *principals) {
+    nsJSPrincipals *self = static_cast<nsJSPrincipals *>(principals);
+    MOZ_ASSERT_IF(self, self->debugToken == DEBUG_TOKEN);
+    return self;
+  }
+  
+  static nsJSPrincipals* get(nsIPrincipal *principal) {
+    nsJSPrincipals *self = static_cast<nsJSPrincipals *>(principal);
+    MOZ_ASSERT_IF(self, self->debugToken == DEBUG_TOKEN);
+    return self;
+  }
+
+  nsJSPrincipals() {
+    refcount = 0;
+    setDebugToken(DEBUG_TOKEN);
+  }
+
+  virtual ~nsJSPrincipals() {
+    setDebugToken(0);
+  }
+
+  /**
+   * Return a string that can be used as JS script filename in error reports.
+   */
+  virtual void GetScriptLocation(nsACString &aStr) = 0;
+
+#ifdef DEBUG
+  virtual void dumpImpl() = 0;
+#endif
+
+  static const uint32_t DEBUG_TOKEN = 0x0bf41760;
+};
+
+#endif /* nsJSPrincipals_h__ */