1 files changed, 46 insertions, 0 deletions
diff --git a/toolkit/modules/nsIE10SUtils.idl b/toolkit/modules/nsIE10SUtils.idl
new file mode 100644
index 0000000000..98fa333c7d
--- /dev/null
+++ b/toolkit/modules/nsIE10SUtils.idl
@@ -0,0 +1,46 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
+ *
+ * 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 nsIPrincipal;
+interface nsIURI;
+
+/**
+ * C++ exposed interface for the `E10SUtils` object from the
+ * `resource://gre/modules/E10SUtils.sys.mjs` module.
+ */
+[scriptable, uuid(1e18680e-052d-4509-a17e-678f5c495e02)]
+interface nsIE10SUtils : nsISupports {
+  cenum RemoteWorkerType: 8 {
+    REMOTE_WORKER_TYPE_SHARED,
+    REMOTE_WORKER_TYPE_SERVICE,
+  };
+
+  /**
+   * Determine what remote type should be used to launch a worker script with
+   * the given principal.
+   *
+   * @param aPrincipal
+   *   The result principal for the document being loaded.
+   * @param aWorkerTypeName
+   *   The type of remote worker being launched (Ci.nsIE10SUtils.REMOTE_WORKER_TYPE_*).
+   * @param aIsMultiProcess
+   *   A boolean to indicate if e10s enabled.
+   * @param aIsFission
+   *   A boolean to indicate if fission is enabled.
+   * @param aPreferredRemoteType
+   *   If multiple remote types are compatible with the worker,
+   *   prefer staying in this remote type.
+   *
+   * @return  The remote type to launch the worker in.
+   */
+  AUTF8String getRemoteTypeForWorkerPrincipal(in nsIPrincipal aPrincipal,
+                                              in nsIE10SUtils_RemoteWorkerType aWorkerType,
+                                              in boolean aIsMultiProcess,
+                                              in boolean aIsFission,
+                                              in AUTF8String aPreferredRemoteType);
+};