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Previously, inView in GetElementLocation only checks for elements
directly under document to see if the point includes the element
under document. However, this does not handle element in shadow DOM.
The change is to check shadow root includes the element at the point
traversing all the way up to document.

Bug: chromedriver:3708
Change-Id: I78cafc847fee3ec4ad850cfaaea66b2f301aa600
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2638653Reviewed-by: John Chen <johnchen@chromium.org>
Commit-Queue: Shengfa Lin <shengfa@google.com>
Cr-Commit-Position: refs/heads/master@{#845215}