Merge "adb: use a custom thread to poll for usb devices on mac."
am: 09c5fcf

* commit '09c5fcf7603f6e75b7859e109a0cec966f00ab3e':
  adb: use a custom thread to poll for usb devices on mac.

Change-Id: Ifaa7385ea6866e27a1fe092fadb991563153fcab