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  - Issue 'tap' gesture events while panning or zooming, to avoid idle
    screen during interaction.
  - Properly disable magnification when magnification gesture is
    turned off.

Bug: internal b/112615721
Bug: internal b/112612596
Test: manual
Change-Id: If6ec273ddab0f70d0c56743e38c0c40b49a579c4
Reviewed-on: https://chromium-review.googlesource.com/1175854Reviewed-by: Alex Sakhartchouk <alexst@chromium.org>
Reviewed-by: Randy Rossi <rmrossi@chromium.org>
Commit-Queue: Ryan Daum <rdaum@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583333}