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Collapsing the sidebar does not trigger the thumbnail bar's intersection
observer. Therefore, toggling annotation mode does not cause the
thumbnails to regenerate to reflect the updated PDF contents.

Hide the thumbnails to trigger the intersection observer when annotation
mode is turned on.

Bug: 1136319
Change-Id: I778be1b28f76354a9186abc64d5e471b2ae6cb62
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2460226
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: Rebekah Potter <rbpotter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#824683}