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At OnLoad event, the renderer notifies browser process of the
anchor elements in the viewport. The browser uses this information
to predict the navigation probability of each of these anchor
elements.

This CL changes the logic in the render side to skip reporting
of elements that are part of ad frames since we expect these
to be clicked less often.

Bug: 899339
Change-Id: I171cce5d4b9f722039222865753f3b7cbe6d8a79
TBR: holte@chromium.org,ryansturm@chromium.org,kinuko@chromium.org
Reviewed-on: https://chromium-review.googlesource.com/c/1315529Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Commit-Queue: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#605013}