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It is possible for a Wayland client to trigger drag & drop operation
from the touchscreen. Exo have used GetCursorScreenPoint() as the
initial drag shadow position, but the method does not return the
expected location when DnD is triggered from the touchscreen.

TEST=manual
BUG=None

Change-Id: I7febd3dacd60603893dee16a96adba05460d6422
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224886Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Tetsui Ohkubo <tetsui@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774002}