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Provides more instruction to users until actual endpoints are available.

Bug: b:111752710
Change-Id: I250269c0848a02ae89480fb6dff20021f8866895
Reviewed-on: https://chromium-review.googlesource.com/1147425
Commit-Queue: David Black <dmblack@google.com>
Reviewed-by: Xiaohui Chen <xiaohuic@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577782}