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This is an experimental feature that allows trusted remote debugging
clients such as Carlo adjust the dock tile details.

Change-Id: I7b263a14f1632d867c8bd3cffdd0527b3f3c96c9
Reviewed-on: https://chromium-review.googlesource.com/c/1337295
Commit-Queue: Dmitry Gozman <dgozman@chromium.org>
Reviewed-by: Dmitry Gozman <dgozman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#608575}