Trigger Translate from hrefTranslate links

This patch triggers auto translate behavior on navigations started from
<a> tags that have an hrefTranslate attribute. It also merges the tests
written by Aaron in https://chromium-review.googlesource.com/c/chromium/src/+/1227173.

Bug: 900586
Change-Id: I1b8e23651ff839ab8cafadf02e72ac6ceca108de
Reviewed-on: https://chromium-review.googlesource.com/c/1315949
Reviewed-by: Hajime Hoshi <hajimehoshi@chromium.org>
Commit-Queue: anthonyvd <anthonyvd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606163}
7 files changed