am f9df6bd6: Merge change 1878 into donut

Merge commit 'f9df6bd6e92fcef6bc32225bde412d3b1c0df180'

* commit 'f9df6bd6e92fcef6bc32225bde412d3b1c0df180':
  Fixes external #2686. Make @android:anim/linear_interpolator public since the default intperpolator for all animations is accelerate_decelerate.