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Will add metrics in a subsequent CL. This shouldn't affect any current
metrics since the support is all behind a feature flag.

Bug: 1050101
Change-Id: If6f98dbae86bb5842803cdb3c1b052d99711e62f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2067241
Commit-Queue: Sophie Chang <sophiechang@chromium.org>
Reviewed-by: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Tarun Bansal <tbansal@chromium.org>
Cr-Commit-Position: refs/heads/master@{#743767}