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If the AdTracker sees an ad script in the stack when a frame is created,
or its parent frame is thought to be an ad, label the LocalFrame as an
ad frame. The subresource filter will then label subsequent requests in
that frame as ad requests.

A future CL will handle situations where the frame changes processes.

Bug: 807640
Change-Id: Ie4d3bab747c3158d310652f6376cc79f6da38b7a
Reviewed-on: https://chromium-review.googlesource.com/1019743
Commit-Queue: Josh Karlin <jkarlin@chromium.org>
Reviewed-by: Nate Chapin <japhet@chromium.org>
Reviewed-by: Charlie Harrison <csharrison@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553845}