Fixes the fling and closest state logic in HomeCardGestureManager.

Fixes the fling and closest state logic in HomeCardGestureManager.

The weak fling should be handled and end the gesture session for
issue 406197. Also, fling handling turns out to check closest
state instead of last_state_. Otherwise there could be a chance
to enter an inconsistent state from the visual.

Also, the area of "closest to minimized" is too small, so I put
50px static height for this.

BUG=406197, 407890
R=oshima@chromium.org
TEST=athena_unittests, manually

Committed: https://crrev.com/efba177008e6b876a085a96426c63566b1efc657
Cr-Commit-Position: refs/heads/master@{#292284}

[Jun Mukai, 2014-08-27 21:20:16]

mukai@chromium.org changed reviewers:
+ oshima@chromium.org
- sadrul@chromium.org

[Jun Mukai, 2014-08-27 21:20:26]

oshima, could you take a look?

[sadrul, 2014-08-27 23:19:54]

sadrul@chromium.org changed reviewers:
+ sadrul@chromium.org

[sadrul, 2014-08-27 23:19:54]

LGTM

Sorry about the delay

[Jun Mukai, 2014-08-27 23:29:23]

The CQ bit was checked by mukai@chromium.org

[commit-bot: I haz the power, 2014-08-27 23:31:04]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/mukai@chromium.org/507653005/1

[commit-bot: I haz the power, 2014-08-28 00:39:42]

Committed patchset #1 (id:1) as 0f24d736081745ea3348cb7edb7adc2d02757e7b

[commit-bot: I haz the power, 2014-09-10 02:56:11]

Patchset 1 (id:??) landed as
https://crrev.com/efba177008e6b876a085a96426c63566b1efc657
Cr-Commit-Position: refs/heads/master@{#292284}