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This allows the text zoom provider (and any other implementations of it)
to decide using its own rules whether text zoom is allowed.

Bug: 1061119
Change-Id: I76de0206d8b42da169d19475a6e263ac68a632e4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2437434
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#811986}