Merge tag 'android-6.0.0_r26' into HEAD

Android 6.0.0 release 26

* tag 'android-6.0.0_r26':
  Power jank for Systemapp
  Disable books jank test as it is nomore a system app
  youtube jank test fix

Change-Id: If4ae91ca44771041972a0633505aecc8c9d63558