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This CL ensures that when focus is restored to PDF, we maintain the
viewport and do not scroll even if the focused annotation is out of
viewport.

Bug: 1085614
Change-Id: Ifc4015b6d393dd1678d839a6636fbd4b335528ef
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224946Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#775202}