79f00cf06f
After reset (docking) Pixel C Keyboard that was previously paired with a device goes into so-called non-discoverable mode, where it will establish connection only with device that it has connected before. When scanning for available devices we need to wait till the keyboard starts advertising itself as discoverable, and only then try to pair. Also, let's flush the device cache when we attach the base to make sure the device that we seen before and cached again in the right state after reset. Bug: 24915541 Change-Id: I136c1c4235080a25529b4b1c2b1da9bc18508811