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Adding TracingObserverProto for serializing memory dump in to proto format needed for migration of memory-infra to Perfetto. See crbug.com/1098746 for more details.

Bug: 1098746
Change-Id: If78a00672263f0cb061d5f505a62da912c2d7091
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2324841
Commit-Queue: Piotr Roguski <piotr.roguski@mobica.com>
Commit-Queue: ssid <ssid@chromium.org>
Reviewed-by: François Doray <fdoray@chromium.org>
Reviewed-by: ssid <ssid@chromium.org>
Reviewed-by: Eric Seckler <eseckler@chromium.org>
Reviewed-by: Robert Sesek <rsesek@chromium.org>
Reviewed-by: Erik Chen <erikchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#813290}