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Implement an HTTP client to make calls to the OnePlatform server
defined here:
https://source.corp.google.com/piper///depot/google3/google/internal/location/nearby/sharing/v1/service.proto

Bug: b/154863110
Change-Id: I0a3b06d067e7f06a0fc933f2cf69aac4ca20036f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2229299Reviewed-by: Josh Nohle <nohle@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Commit-Queue: Curt Clemens <cclem@google.com>
Cr-Commit-Position: refs/heads/master@{#782646}