Improve autofill perf test.

1. Add TextWatcher and move some init task here.
2. Enable verbose log during the tests.
3. Wait service connected then get the FillRequest.
4. Only do ui thread needed tasks in the UiThread.
5. Correct error copyright format.

Bug: 165822715
Test: atest AutofillPerfTests
Change-Id: I81838abd4810473d1f4d22f860cf6570e6f0e857