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This CL just adds the framework for the option in the popup menu (gated
behind a flag).

It uses the same flag that already exists for the text zoom web
feature.

I'm still waiting on the correct icon from design. I'll update that
once I get it.

Bug: 1028938
Change-Id: I7fb26da61c10b4550ec836529ec7dbb09b522a75
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1939972
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Jesse Doherty <jwd@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#720169}