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This fixes the attached bug since the cause is that the XTest pointer
is generating window crossing events (XI_Leave/XI_Enter) when implicitly
capturing the pointer for the slave device. For physical devices, these
events are generated only for the master pointer.

This CL fixes it by letting the crossing events pass through the
filtering checks applied by ShouldProcessXI2Event.
pointer_device_lookup_ stores only the master pointers so this filters
out the test slave.

I haven't been able to determine what makes the XTest pointer but the
fix makes sense since window crossing events only make sense on a
pointer and in that case we should always use the master.

Bug: 683434
Change-Id: Id96dacb6db49a95fae33105de2fcfe2b9f8d1b44
Reviewed-on: https://chromium-review.googlesource.com/883601
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531882}