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By handling serialization of each type explicitly, we avoid serializing
padding bytes.

Bug: 973801,1106091
Change-Id: I9f4e6b82fb484b9256b25b531cc2d51c800425bb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2309004
Commit-Queue: Khushal <khushalsagar@chromium.org>
Reviewed-by: Khushal <khushalsagar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#791110}