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This CL makes sure DetectedBarcode interface is serializable so that
DetectedBarcode can easily be transfered from workers.

Change-Id: I539dfa2dcba7873ccad4df76b8531c797d88072c
Reviewed-on: https://chromium-review.googlesource.com/1246452Reviewed-by: Miguel Casas <mcasas@chromium.org>
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Cr-Commit-Position: refs/heads/master@{#594633}