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This CL connects the TabLayout int the keyboard accessory with the
ViewPager in the accessory sheet.
This means the visibility of keyboard and tabs can be controlled by the
ManualFillingCoordinator and is decoupled from the accessory.

Bug: 828832, 811747
Change-Id: I01f225458d068e75fde19398fc352672779d23c0
Reviewed-on: https://chromium-review.googlesource.com/1091190
Commit-Queue: Friedrich Horschig <fhorschig@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#567196}