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When building hit test data for v2, root_view could be overlapped by
ui::Layers on CrOS which it shouldn't. This leads to all hit testing
on CrOS with v2 hit test data becoming async.

This patch ignores the kHitTestAsk flag for root if it was caused by
being overlapped. The best way to fix this is not setting the flag
upon building the hit test data in LTHI. Will try to do that in a
follow up patch.

Bug: 999576, 996865
Change-Id: I84ad8fa6a732f52a9bc2f40149954562da5ef69a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1787118
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Cr-Commit-Position: refs/heads/master@{#693929}