Fix multi-pointer behavior for Snackbar.

A. Fixes CoordinatorLayout to only reset once for multiple
   requestDisallowInterceptTouchEvent calls.
B. Fixes SwipeDismissBehavior to only reset on a new active
   capture/drag.

Part A fixes the crash for multi finger swipe of snackbar.

Bug: 27675378
Change-Id: I58ffd71c2887ea32e450fdf8b2203eb82b2b55c5
2 files changed