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Input event on the padding / border of an iframe should be claimed by
its parent frame. See example here: https://jsbin.com/xozuwil/quiet.

However, clicking on the padding is considered as clicking the iframe
according to blink hit test. When VizHitTesting asks blink for hit test
target, it gets the iframe which is inconsistent with VizHitTesting
result where the parent frame is considered as the target.

This patch takes the padding and border into account when asking blink
for the hit test result and only accepts iframe as the target if the
hit test point is inside the content box of the iframe.

Note that fixing the inconsistency between blink hit test and viz hite
test is tracked via crbug.com/753124.

Bug: 977180
Change-Id: Ia0c36b68ef0428a19f7ae94f2ae9bf575f55f0b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1699589
Commit-Queue: Yi Gu <yigu@chromium.org>
Reviewed-by: Mike Pinkerton <pinkerton@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Cr-Commit-Position: refs/heads/master@{#678499}