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[CrOS Tether] Create BleScanner, a class which scan BLE advertisements and identifies nearby devices.

This class provides an API for registering or unregistering RemoteDevices. As long as at least one RemoteDevice is registered, a discovery session is active. If an advertisement from a registered RemoteDevice is scanned, observers are notified.

BUG=672263

Review-Url: https://codereview.chromium.org/2604063003
Cr-Commit-Position: refs/heads/master@{#441484}