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Upon entering Presentation mode:
 - Disable scrolling and hide scrollbars.
 - Disable zooming with ctrl+wheel and pinch gestures.
 - Force fit-to-height.
 - Next/previous page can be shown using the left/right keyboard
  arrows.

The following known issues
 - Zooming is still possible with ctrl+/-
 - Rotating is still possible via ctrl]/[
 - Using the scroll wheel does not update to the next/previous page

will be addressed in a follow up CL.

Bug: 1148478
Change-Id: I8b0e3b9ea6c3ed6738bc07f313935c7ea4d770a7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2539741
Commit-Queue: dpapad <dpapad@chromium.org>
Reviewed-by: Daniel Hosseinian <dhoss@chromium.org>
Cr-Commit-Position: refs/heads/master@{#832284}