diff -r 000000000000 -r 6474c204b198 mobile/android/base/sync/repositories/delegates/DeferredRepositorySessionFinishDelegate.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/sync/repositories/delegates/DeferredRepositorySessionFinishDelegate.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,51 @@
+/* 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.repositories.delegates;
+
+import java.util.concurrent.ExecutorService;
+
+import org.mozilla.gecko.sync.repositories.RepositorySession;
+import org.mozilla.gecko.sync.repositories.RepositorySessionBundle;
+
+public class DeferredRepositorySessionFinishDelegate implements
+    RepositorySessionFinishDelegate {
+  protected final ExecutorService executor;
+  protected final RepositorySessionFinishDelegate inner;
+
+  public DeferredRepositorySessionFinishDelegate(RepositorySessionFinishDelegate inner,
+                                                 ExecutorService executor) {
+    this.executor = executor;
+    this.inner = inner;
+  }
+
+  @Override
+  public void onFinishSucceeded(final RepositorySession session,
+                                final RepositorySessionBundle bundle) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        inner.onFinishSucceeded(session, bundle);
+      }
+    });
+  }
+
+  @Override
+  public void onFinishFailed(final Exception ex) {
+    executor.execute(new Runnable() {
+      @Override
+      public void run() {
+        inner.onFinishFailed(ex);
+      }
+    });
+  }
+
+  @Override
+  public RepositorySessionFinishDelegate deferredFinishDelegate(ExecutorService newExecutor) {
+    if (newExecutor == executor) {
+      return this;
+    }
+    throw new IllegalArgumentException("Can't re-defer this delegate.");
+  }
+}
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