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Fix test that was passing accidentally when it shouldn't have been

PointerTest.IgnorePointerEventDuringModal was passing when it shouldn't
have been. These change fixes it with correct assertions and splits it
into three separate and more clear test scenarios.

Bug: 973693
Test: exo_unittests
Change-Id: Icd9b95a8634ff47cb12ae55208229d9a15c69fa0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1658840
Auto-Submit: Jorge Gil <jorgegil@google.com>
Reviewed-by: Mitsuru Oshima <oshima@chromium.org>
Commit-Queue: Mitsuru Oshima <oshima@chromium.org>
Cr-Commit-Position: refs/heads/master@{#669920}