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diff --git a/dom/webidl/ChromeUtils.webidl b/dom/webidl/ChromeUtils.webidl
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+++ b/dom/webidl/ChromeUtils.webidl
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+/* -*- Mode: IDL; 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/.
+ */
+
+/**
+ * A collection of static utility methods that are only exposed to Chrome. This
+ * interface is not exposed in workers, while ThreadSafeChromeUtils is.
+ */
+[ChromeOnly, Exposed=(Window,System)]
+interface ChromeUtils : ThreadSafeChromeUtils {
+  /**
+   * A helper that converts OriginAttributesDictionary to a opaque suffix string.
+   *
+   * @param originAttrs       The originAttributes from the caller.
+   */
+  static ByteString
+  originAttributesToSuffix(optional OriginAttributesDictionary originAttrs);
+
+  /**
+   * Returns true if the members of |originAttrs| match the provided members
+   * of |pattern|.
+   *
+   * @param originAttrs       The originAttributes under consideration.
+   * @param pattern           The pattern to use for matching.
+   */
+  static boolean
+  originAttributesMatchPattern(optional OriginAttributesDictionary originAttrs,
+                               optional OriginAttributesPatternDictionary pattern);
+
+  /**
+   * Returns an OriginAttributesDictionary with values from the |origin| suffix
+   * and unspecified attributes added and assigned default values.
+   *
+   * @param origin            The origin URI to create from.
+   * @returns                 An OriginAttributesDictionary with values from
+   *                          the origin suffix and unspecified attributes
+   *                          added and assigned default values.
+   */
+  [Throws]
+  static OriginAttributesDictionary
+  createOriginAttributesFromOrigin(DOMString origin);
+
+  /**
+   * Returns an OriginAttributesDictionary that is a copy of |originAttrs| with
+   * unspecified attributes added and assigned default values.
+   *
+   * @param originAttrs       The origin attributes to copy.
+   * @returns                 An OriginAttributesDictionary copy of |originAttrs|
+   *                          with unspecified attributes added and assigned
+   *                          default values.
+   */
+  static OriginAttributesDictionary
+  fillNonDefaultOriginAttributes(optional OriginAttributesDictionary originAttrs);
+
+  /**
+   * Returns true if the 2 OriginAttributes are equal.
+   */
+  static boolean
+  isOriginAttributesEqual(optional OriginAttributesDictionary aA,
+                          optional OriginAttributesDictionary aB);
+};
+
+/**
+ * Used by principals and the script security manager to represent origin
+ * attributes. The first dictionary is designed to contain the full set of
+ * OriginAttributes, the second is used for pattern-matching (i.e. does this
+ * OriginAttributesDictionary match the non-empty attributes in this pattern).
+ *
+ * IMPORTANT: If you add any members here, you need to do the following:
+ * (1) Add them to both dictionaries.
+ * (2) Update the methods on mozilla::OriginAttributes, including equality,
+ *     serialization, deserialization, and inheritance.
+ * (3) Update the methods on mozilla::OriginAttributesPattern, including matching.
+ */
+dictionary OriginAttributesDictionary {
+  unsigned long appId = 0;
+  unsigned long userContextId = 0;
+  boolean inIsolatedMozBrowser = false;
+  DOMString addonId = "";
+  unsigned long privateBrowsingId = 0;
+  DOMString firstPartyDomain = "";
+};
+dictionary OriginAttributesPatternDictionary {
+  unsigned long appId;
+  unsigned long userContextId;
+  boolean inIsolatedMozBrowser;
+  DOMString addonId;
+  unsigned long privateBrowsingId;
+  DOMString firstPartyDomain;
+};