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This change implements the methods in BluetoothChooserContext and
creates a unit test for the class.

Design Doc:
https://docs.google.com/document/d/1h3uAVXJARHrNWaNACUPiQhLt7XI-fFFQoARSs1WgMDM/edit?usp=sharing

Bug: 589228
Change-Id: I1c564177063f9459081c45ddb4c0bb757fabd667
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1978819
Commit-Queue: Ovidio de Jesús Ruiz-Henríquez <odejesush@chromium.org>
Reviewed-by: Reilly Grant <reillyg@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Cr-Commit-Position: refs/heads/master@{#731730}