GitLab

- Does not break bot, but attempts to wait until phone boots
- Minor fixes to adb_device_functions

BUG=141899

Review URL: https://chromiumcodereview.appspot.com/10837180

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@152052 0039d316-1c4b-4281-b951-d872f2087c98