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With this CL, the manual filling component ensures that the keyboard
accessory and its sheet display only data that is relevant to the active
tab.

It introduces a mediator controlled and wired up by the already existing
ManualFillingCoordinator. It is responsible to propagate visibility
changes to all subcomponents and update their state depending on the
active browser tab.

Bug: 828832, 811747
Change-Id: I247fcbbc554c06624c12ffe42597d6f671042336
Reviewed-on: https://chromium-review.googlesource.com/1100760
Commit-Queue: Friedrich Horschig <fhorschig@chromium.org>
Reviewed-by: Bernhard Bauer <bauerb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#568053}