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The HitTestDataChangeObserver requires a clean state of HitTestData
before any change happens. Previously we didn't check whether child1's
hit test data are ready or not. If its data arrive after the pointer
events change, the HitTestDataChangeObserver will not work properly.

Bug: 968970
Change-Id: Ib00a324ff0960c85c98c7f0800ef300cc4ebddd4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1837147Reviewed-by: Bo <boliu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#702489}