Merge changes I35aae129,I59239c39,Id685bf74,Ic4f27fdb,I2a2b6b50 am: 2a74fe2f63 am: da2d3e03be
am: f87e7a23fa

* commit 'f87e7a23fae75f92f2d2fff6bfa5bd7e0831daa8':
  Add a gdb_flags argument to gdbrunner.start_gdb.
  Allow gdbrunner.start_gdbserver to not upload gdbserver.
  Add get_pids helper to gdbrunner.
  Don't throw when we fail to find a device.
  Allow selection of adb command.