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[Autofill Assistant] All messages to the server now contain the active field trials of the client as part of the ClientContextProto.

This will allow the server to log the field trial state, which in turn will allow us to analyze how user behavior changes with respect to the active field trials. Serializing all active field trials makes this easier to maintain at the cost of some additional message overhead and log storage. For each active field trial, the trial name and the name of the randomly selected trial group are sent.

Bug: 806868
Change-Id: I0417b3d548f36ca8c98c80182ec314e8bb20eba0
Reviewed-on: https://chromium-review.googlesource.com/c/1326014Reviewed-by: Stephane Zermatten <szermatt@chromium.org>
Commit-Queue: Clemens Arbesser <arbesser@google.com>
Cr-Commit-Position: refs/heads/master@{#606801}