Merge "Wait for the correct event in PersisterQueueTests" into main

                processDuration < PRE_TASK_DELAY_MS);

        assertTrue("Target didn't call callback enough times.",

                mFactory.waitForAllExpectedItemsProcessed(TIMEOUT_ALLOWANCE));

                mListener.waitForAllExpectedCallbackDone(TIMEOUT_ALLOWANCE));

        // Once before processing this item, once after that.

        assertEquals(2, mListener.mProbablyDoneResults.size());

        // The last one must be called with probably done being true.