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Adds a FakeBluetoothChooserClient associated interface that will be used by
FakeBluetoothChooser to send FakeBluetoothChooserEvents to the client as
they happen. Since this feature completes the Fake Bluetooth scanning
API, this change also converts a test to use the new API.

BUG=719827

Change-Id: I2770b3642ae93339e16b594591e4b4075e8246c5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/961719
Commit-Queue: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Reviewed-by: Mike West <mkwst@chromium.org>
Reviewed-by: Giovanni Ortuño Urquidi <ortuno@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659096}