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This service is currently used only within the same process, and
potentially large amounts of data are transfered over its interfaces, so
this seems a prime candidate for lazy serialization, and should help
some with mojo localstorage performance.

Bug: 730475
Change-Id: Iff573b33f1bfda2193d6bfb5366b9d24f8190150
Reviewed-on: https://chromium-review.googlesource.com/580509Reviewed-by: Ken Rockot <rockot@chromium.org>
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488459}