cros: Fix mouse over-scroll animation not happening.

cros: Fix mouse over-scroll animation not happening.

This is because mouse scroll event does not set scrolling_ flag. Changed to use
reverting animation as a signal for bubble over-scroll animation.

Also fixed a problem that bubble over-scroll animation is interrupted when mouse hovers on an item during the animation.

BUG=150852
TEST=Verify that bubble over-scroll animation happens with both touch and mouse.

R=sky@chromium.org


Committed: http://src.chromium.org/viewvc/chrome?view=rev&revision=157905

[xiyuan, 2012-09-20 18:21:11]

Please hold off reviewing this CL. Found some undesirable effect and will ping
again once I addressed that. :(

[xiyuan, 2012-09-20 19:16:38]

Cl is ready for review now.

Found that when widget moves during over-scroll, we actually get mouse move
events. If mouse is hovering to a new item, the item will try to auto select
itself and update current page. This would interrupts the over-scroll animation.
Fixed the problem by ignoring mouse hover in running page transition.

[sky, 2012-09-20 19:51:34]

LGTM

[commit-bot: I haz the power, 2012-09-20 22:45:57]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/xiyuan@chromium.org/10961020/1004

[commit-bot: I haz the power, 2012-09-21 02:36:46]

Change committed as 157905