Merge "adb: use a custom thread to poll for usb devices on mac." into nyc-dev am: f7c31b9
am: 2282c76

* commit '2282c76857cd5e1e14af4dc15d65e9e6f1a00adc':
  adb: use a custom thread to poll for usb devices on mac.

Change-Id: I5bef9ce5a1589ea683c5bb40f1adf269f9facbff