Whitelist serialized objects wrt MSAN.
Whitelist serialized objects wrt MSAN.

R=jochen@chromium.org
BUG=chromium:457459
LOG=N

Review URL: https://codereview.chromium.org/919613002

Cr-Commit-Position: 972c6d2dc6dd5efdad1377c0d224e03eb8f276f7@{#26578}

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh