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When PDF contents are rotated, rotate the canvases holding the
thumbnail images using CSS. Resize the divs holding the canvaves so that
the layouts of the thumbnails are updated.

Bug: 652400
Change-Id: Ib17fbba2905ac71a38d310ea1dd419933d7785eb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2438476
Commit-Queue: Daniel Hosseinian <dhoss@chromium.org>
Reviewed-by: John Lee <johntlee@chromium.org>
Cr-Commit-Position: refs/heads/master@{#812242}