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Some javascript frameworks (e.g. React) or pages have a cache version of input fields in
pages.
This cache will override the autofill value of the fields.
When value is changed, events must be sent to update these cache.
When a user type in a field, the following events are usually sent:
- keydown
- input
- change
- keyup
By testing, most framework use use one of these events, and some framework use
the data field of the event as new value.

Send these events when updating fields.

Bug: 783025, 728631, 732360
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I147a4471ecd2e389cfca57d2aa9d78f61360aa61
Reviewed-on: https://chromium-review.googlesource.com/771674
Commit-Queue: Olivier Robin <olivierrobin@chromium.org>
Reviewed-by: Moe Ahmadi <mahmadi@chromium.org>
Reviewed-by: Peter Lee <pkl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#520946}