am a7af4a3d: am e47f55c3: Improve desktop scrolling from the previews switcher.

Merge commit 'a7af4a3d60bc3be1138688e3237339b43b1f150e' into eclair-mr2-plus-aosp

* commit 'a7af4a3d60bc3be1138688e3237339b43b1f150e':
  Improve desktop scrolling from the previews switcher.