Tab UI with translate functionality

This CL completes the implementation for TAB UI with translate functionality enabled.

Bug: 963148
Change-Id: I68098f5eacdaecd07727b9590ff794c14e38a2cf
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1621553
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Reviewed-by: anthonyvd <anthonyvd@chromium.org>
Commit-Queue: Haohao Wang <hhw@google.com>
Cr-Commit-Position: refs/heads/master@{#663409}
5 files changed