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To enable impl-side frame attribution, add an association between layers
and their containing frames. This element ID may be used later to look
up the document via its associated DOM node ID.

Bug: 910421
Change-Id: I5a70d2f42f94d72f76d9c4eb49cd6ee691e1f0f6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2077038Reviewed-by: Philip Rogers <pdr@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Stefan Zager <szager@chromium.org>
Commit-Queue: Andrew Comminos <acomminos@fb.com>
Cr-Commit-Position: refs/heads/master@{#749508}