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

Change-Id: Ic5ac034ae4f472c34ae75ec001cfda5af97cf6a9
Reviewed-on: https://chromium-review.googlesource.com/1243023
Commit-Queue: François Beaufort <beaufort.francois@gmail.com>
Reviewed-by: Miguel Casas <mcasas@chromium.org>
Cr-Commit-Position: refs/heads/master@{#594452}