app_list: Make over scroll animation faster.

app_list: Make over scroll animation faster.

- Add an over scroll animation duration of 50ms;
- Use the over scroll animation duration for transition to invalid page
  (i.e. over scroll); This was using normal page transition duration of 180ms
  before.
- Use the same duration for snap back animation; This was 100ms and now changed
  to 50ms.

Also fixed a bug that app launcher bubble moves to wrong location if starting an
over scroll before previous over scroll snap back animation finishes.

BUG=160590
TEST=Verify over scroll animation is fast enough.

R=sky@chromium.org


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=167784

[sky, 2012-11-14 22:02:41]

LGTM

[commit-bot: I haz the power, 2012-11-14 22:07:42]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/xiyuan@chromium.org/11275320/1

[commit-bot: I haz the power, 2012-11-15 00:26:09]

Change committed as 167784