diff -r 000000000000 -r 6474c204b198 mobile/android/base/sync/UnexpectedJSONException.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/sync/UnexpectedJSONException.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;
+
+public class UnexpectedJSONException extends Exception {
+  private static final long serialVersionUID = 4797570033096443169L;
+
+  public UnexpectedJSONException(String detailMessage) {
+    super(detailMessage);
+  }
+
+  public static class BadRequiredFieldJSONException extends UnexpectedJSONException {
+    private static final long serialVersionUID = -9207736984784497612L;
+
+    public BadRequiredFieldJSONException(String string) {
+      super(string);
+    }
+  }
+}