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Implement BleMedium::StartScanning() and BleMedium::StopScanning().
This requires adding a ServiceDataMap (mapping from service id to
service data) to bluetooth::mojom::DeviceInfo, to represent BLE
advertisements.

See go/nearby-chrome-bt for more details.

Bug: b:154848193
Change-Id: I40489f8128bcda9409b20b43be52e73b2a9a2240
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2370094
Commit-Queue: Ryan Hansberry <hansberry@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Cr-Commit-Position: refs/heads/master@{#805582}