diff -r 000000000000 -r 6474c204b198 mobile/android/base/sync/net/WBOCollectionRequestDelegate.java
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mobile/android/base/sync/net/WBOCollectionRequestDelegate.java	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,35 @@
+/* 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.net;
+
+import org.mozilla.gecko.sync.crypto.KeyBundle;
+import org.mozilla.gecko.sync.CryptoRecord;
+import org.mozilla.gecko.sync.KeyBundleProvider;
+
+/**
+ * Subclass this to handle collection fetches.
+ * @author rnewman
+ *
+ */
+public abstract class WBOCollectionRequestDelegate
+extends SyncStorageCollectionRequestDelegate
+implements KeyBundleProvider {
+
+  @Override
+  public abstract KeyBundle keyBundle();
+  public abstract void handleWBO(CryptoRecord record);
+
+  @Override
+  public void handleRequestProgress(String progress) {
+    try {
+      CryptoRecord record = CryptoRecord.fromJSONRecord(progress);
+      record.keyBundle = this.keyBundle();
+      this.handleWBO(record);
+    } catch (Exception e) {
+      this.handleRequestError(e);
+      // TODO: abort?! Allow exception to propagate to fail?
+    }
+  }
+}