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The ArcSharesheetBridge will receive share requests from Android
and handle them with Chrome's sharesheet in a Chrome Custom Tab.

This change sets up the skeleton to accept connections from
Android.

BUG=b:172963488
TEST=Deployed chrome, and verified share intents is received from
     Android using Android's APIDemos apk.

Change-Id: Ib14e414f65c3bb7b675a0d1a0d846fc3a17b0769
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2531394
Auto-Submit: Prameet Shah <phshah@chromium.org>
Commit-Queue: Josh Horwich <jhorwich@chromium.org>
Reviewed-by: Josh Horwich <jhorwich@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Reviewed-by: Maggie Cai <mxcai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#826374}