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Because of various technical details, we can show search bubbles only in
cases in which the UI is fairly stably visible (i.e. not subpages).

Screenshots: https://bugs.chromium.org/p/chromium/issues/detail?id=355446#c14

Bug: 355446
Change-Id: I732e64da8916e183655e406b18f06f0a0b02ed31
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1962797
Commit-Queue: Dan Beam <dbeam@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Auto-Submit: Dan Beam <dbeam@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727536}