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Currently we ignore these, but properly interfacing with chrome's
drag&drop implementation will require distinguishing between pointer
and touch events from the event serial. This CL adds a mechanism to do
this.

Bug: 927324
Change-Id: If829533c4b5b28b3b2b4eb5826dfe687df0de792
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1709497
Commit-Queue: Fergus Dall <sidereal@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681210}