Enable basic password autofill functionality for ios web view - Save password after login and autofill password form when going back to the login page.

Bug: 865114
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I4f6e3f40500bb667959110d5f0eb3f07c85bca94
Reviewed-on: https://chromium-review.googlesource.com/1198672
Reviewed-by: Vasilii Sukhanov <vasilii@chromium.org>
Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: Scott Wu <scottwu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#590146}
9 files changed