Allow browsing contexts to resolve to cross-origin windows.

components/script/dom/webidls/DissimilarOriginLocation.webidl

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+/* 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/. */
+
+
+// This is a Servo-specific interface, used to represent locations
+// that are not similar-origin, so live in another script thread.
+// It is based on the interface for Window, but only contains the
+// accessors that do not throw security exceptions when called
+// cross-origin.
+//
+// Note that similar-origin locations are kept in the same script
+// thread, so this mechanism cannot be relied upon as the only
+// way to enforce security policy.
+
+// https://html.spec.whatwg.org/multipage/#location
+[Unforgeable, NoInterfaceObject] interface DissimilarOriginLocation {
+  [Throws] attribute USVString href;
+  [Throws] void assign(USVString url);
+  [Throws] void replace(USVString url);
+  [Throws] void reload();
+  [Throws] stringifier;
+
+  // TODO: finish this interface
+};

components/script/dom/webidls/DissimilarOriginWindow.webidl

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+/* 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/. */
+
+// This is a Servo-specific interface, used to represent windows
+// that are not similar-origin, so live in another script thread.
+// It is based on the interface for Window, but only contains the
+// accessors that do not throw security exceptions when called
+// cross-origin.
+//
+// Note that similar-origin windows are kept in the same script
+// thread, so this mechanism cannot be relied upon as the only
+// way to enforce security policy.
+
+// https://html.spec.whatwg.org/multipage/#window
+[Global, NoInterfaceObject]
+interface DissimilarOriginWindow : GlobalScope {
+  [Unforgeable] readonly attribute WindowProxy window;
+  [BinaryName="Self_", Replaceable] readonly attribute WindowProxy self;
+  [Unforgeable] readonly attribute WindowProxy? parent;
+  [Unforgeable] readonly attribute WindowProxy? top;
+  [Replaceable] readonly attribute WindowProxy frames;
+  [Replaceable] readonly attribute unsigned long length;
+  [Unforgeable] readonly attribute DissimilarOriginLocation location;
+
+  void close();
+  readonly attribute boolean closed;
+  void postMessage(any message, DOMString targetOrigin);
+  attribute any opener;
+  void blur();
+  void focus();
+};