[ios] Add js injection for password generation

Bug: 886583

Change-Id: I557d7204102f4a28cfb1f6d91a37df50e117e3bd
Reviewed-on: https://chromium-review.googlesource.com/c/1379898
Reviewed-by: Vadym Doroshenko <dvadym@chromium.org>
Reviewed-by: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Commit-Queue: David Jean <djean@chromium.org>
Cr-Commit-Position: refs/heads/master@{#623202}
14 files changed