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This CL adds JS injection to support interacting with forms. To be used
to get the content of the current field, and set values on the fields.

Bug: 845472
Cq-Include-Trybots: luci.chromium.try:ios-simulator-full-configs;master.tryserver.chromium.mac:ios-simulator-cronet
Change-Id: I860ebf4e2181f53658c0e519c5b3290ec86ac46f
Reviewed-on: https://chromium-review.googlesource.com/1073407
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Reviewed-by: Olivier Robin <olivierrobin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#561891}