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1. Encapsulated the test logic of checking click action of
TableViewInfoButtonItem.
2. Added EG test to save password settings UI.
3. Added the accessibility IDs of save password switch item and managed
item to constants file.

Bug: 1131052
Change-Id: Ice93cde0f2db4917d66293188faa063e16869e08
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2436690
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Reviewed-by: Sergio Collazos <sczs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812264}