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This adds a StartServiceWorkerAndDispatchLongRunningMessage call in
ConnectionEstablisherImpl to initiate background connection between
Android Messages for Web service worker to and the Tachyon backend.

Bug: 850823
Change-Id: I71b448b46f5802f741a1d7b6b4f09367defb0365
Reviewed-on: https://chromium-review.googlesource.com/1180417Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Jeremy Klein <jlklein@chromium.org>
Commit-Queue: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#584235}