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We used to only look at the eventual target iframe's hit test flag to
determine whether we need async event targeting. This is fine with v1
set up because all non-trivial iframes have kHitTestAsk flag. But this
resulted in a bug in v2 in this situation:

When we have nested main_frame->parent_frame->child_frame and only the
mid-level parent_frame has kHitTestAsk flag, we will directly dispatch
event to child_frame. This is not correct because parent_frame may have
overlapping regions with main_frame divs. This patch makes RWHIER always
ask when it encouters a mid-level kHitTestAsk flag.

Bug: 896786
Change-Id: Ib9c81ad44d562b251515d8f4dcde572db8d1fa1d
Reviewed-on: https://chromium-review.googlesource.com/c/1310114Reviewed-by: Ken Buchanan <kenrb@chromium.org>
Reviewed-by: Ria Jiang <riajiang@chromium.org>
Commit-Queue: Xianda Sun <sunxd@chromium.org>
Cr-Commit-Position: refs/heads/master@{#606145}