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This CL adds gesture handling to the GMC dialog to allow users on touch
devices to dismiss sessions by swiping.

Bug: 1008905
Change-Id: I115a21ca37af7d128478139d25a1bc0dae4c0c57
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1829671
Commit-Queue: Tommy Steimel <steimel@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Cr-Commit-Position: refs/heads/master@{#705612}