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1. If the target hit-test region we find in HitTestQuery has kHitTestAsk
flag set, we need to fall back to the slow path - ask renderer to do the
targeting. Return the viz::Target we find with kHitTestAsk in that case.

2. In RenderWidgetHostInputEventRouter::FindViewAtLocation, set
RenderWidgetTargetResult::should_query_view to be true if kHitTestAsk is
set in the target we received.

Bug: 803548
Test: viz_unittests
Cq-Include-Trybots: master.tryserver.chromium.android:android_optional_gpu_tests_rel
Change-Id: I7df66f2e09a15308ee02ee4918ab1f43077b1fbd
Reviewed-on: https://chromium-review.googlesource.com/876997Reviewed-by: Robert Kroeger <rjkroege@chromium.org>
Commit-Queue: Ria Jiang <riajiang@chromium.org>
Cr-Commit-Position: refs/heads/master@{#531060}