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Monitor the source of the input and change events.
If the last value was set programmatically, allow to overwrite the value
by autofill.
This is the ios version of https://chromium-review.googlesource.com/c/chromium/src/+/1069226

Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I1b05f02bc93d9e77ce3de9fc939936766a659d87
Reviewed-on: https://chromium-review.googlesource.com/1092858
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Cr-Commit-Position: refs/heads/master@{#565950}