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A new onPinTransfersUpdated event is also added to FileManagerPrivate
API, which will be fired by Chrome to notify the UI of pinning status.
The new visual signal is hooked up to and updated by this event.

Bug: 1137617
Change-Id: Icc5cb9f0b2851acc1d10839c9532d6d9a7e14fb3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2474076Reviewed-by: Jun Mukai <mukai@chromium.org>
Reviewed-by: Sergei Datsenko <dats@chromium.org>
Reviewed-by: Luciano Pacheco <lucmult@chromium.org>
Commit-Queue: Austin Tankiang <austinct@chromium.org>
Cr-Commit-Position: refs/heads/master@{#821576}