[Android Mfill] Reenable integration tests

This CL reenables all Autofill and Manual Filling Integration tests that
previously flaked due to keyboard timing, unstable UI or were disabled
because autofill chips were not yet available.

Minor fix: Rescroll the chips when switching the focused field.

Bug: 838922, 836027, 847959, 894428, 911056, 919988
Change-Id: I2fcfdc4016da5952cddf79f2d5c33180d89b7e1f
Reviewed-on: https://chromium-review.googlesource.com/c/1459552
Reviewed-by: Rouslan Solomakhin <rouslan@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Commit-Queue: Friedrich [CET] <fhorschig@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630704}
6 files changed