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Clicking ElementInspect button would toggle entering/exiting
inspector mode. However, previously clicking that button in
inspector mode would be handled by pinned element logic. In this
CL, we capture returned window element's active state. If the
window is not active, pinned element logic should not mark the
event as handled to give frontend a chance to handle the event.

BUG=899000

Change-Id: I4356f85f0ec6d90298473bb894f197aa4ab733e3
Reviewed-on: https://chromium-review.googlesource.com/c/1306403Reviewed-by: Leonard Grey <lgrey@chromium.org>
Commit-Queue: Wei Li <weili@chromium.org>
Cr-Commit-Position: refs/heads/master@{#604317}