diff -r 000000000000 -r 6474c204b198 mobile/android/base/sync/delegates/KeyUploadDelegate.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/sync/delegates/KeyUploadDelegate.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,21 @@
+/* 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/. */
+
+package org.mozilla.gecko.sync.delegates;
+
+public interface KeyUploadDelegate {
+  /**
+   * Called when keys have been successfully uploaded to the server.
+   * <p>
+   * The uploaded keys are intentionally not exposed. It is possible for two
+   * clients to simultaneously upload keys and for each client to conclude that
+   * its keys are current (since the server returned 200 on upload). To shorten
+   * the window wherein two such clients can race, all clients should upload and
+   * then immediately re-download the fetched keys.
+   * <p>
+   * See Bug 692700, Bug 693893.
+   */
+  void onKeysUploaded();
+  void onKeyUploadFailed(Exception e);
+}