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Certain UI elements, such as the thumbnails and the annotations dialog,
require the number of rotations on the PDF content.

Currently, that value is tracked both on the UI and the plugin backend,
but they can go out of sync because:
- The UI value is updated synchronously whenever the rotate button is
clicked.
- The plugin value updates when a rotate request comes from the UI or
the context menu.

Therefore, the true value is held in the plugin, as the rotate requests
from the context menu do not go through the UI.

Furthermore, the number of rotations from the plugin is already sent to
the UI on the 'documentDimensions' message. Use that value instead.

Fixed: 1166590
Change-Id: Ia7fa111ae338a863828fd1196715684301d7b5c3
Bug: 1166590
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2630428
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: dpapad <dpapad@chromium.org>
Auto-Submit: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844746}