Add SetDiscoveryFilter to Bluetooth Adapter.

This patch adds SetDiscoveryFilter method to BluetoothAdapter.
Implementation for ChromeOS platform together with tests will follow.

BUG=407773
[email protected]

Review URL: https://codereview.chromium.org/1068473002

Cr-Commit-Position: refs/heads/master@{#324922}
19 files changed