am e73f0dfc: Merge "Added adb_interface.WaitForProcess and WaitForProcessEnd."

Merge commit 'e73f0dfc64a55dcdcac92a2cab93de677042fb07' into gingerbread-plus-aosp

* commit 'e73f0dfc64a55dcdcac92a2cab93de677042fb07':
  Added adb_interface.WaitForProcess and WaitForProcessEnd.