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This CL supports the pingback for HTTPS Server Previews URLLoader
implementation. During committed preview decision time, if we are
serving a lite page, the ServerLitePageInfo is backfilled from the
navigation handle. This does not support reporting on failures.

Bug: 921757,936496
Change-Id: Ic474e0d1bd49f6a181704edcfe24e5f1025d6089
Reviewed-on: https://chromium-review.googlesource.com/c/1487916
Commit-Queue: Ryan Sturm <ryansturm@chromium.org>
Reviewed-by: Robert Ogden <robertogden@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636241}