Fixed MaximizeModeWindowState::UpdateWindowPosition(...) to not animate incorrectly.

Fixed MaximizeModeWindowState::UpdateWindowPosition(...) to not animate incorrectly.

Screen rotation animations were slow and janky on low end hardware. This was due to animations being incorrectly initiated on the window bounds changed events.

TEST=Compared animation behavior pre-change and post-change for maximizable & non-maximizable windows when entering and exiting Touchview.  Tested after opening windows when Touchview was active and when it was not.

BUG=471341
Committed: https://crrev.com/bbe5bb16c1c1f1adc3ea477e2929871664f7e323
Cr-Commit-Position: refs/heads/master@{#322643}

[bruthig, 2015-03-27 20:07:40]

bruthig@chromium.org changed reviewers:
+ skuhne@chromium.org

[bruthig, 2015-03-27 20:07:40]

skuhne@, can you please have a look?

Ideally I'd like to get this in to a canary build by early next week so
designers can make a call on which screen rotation animation we use.

[Mr4D (OOO till 08-26), 2015-03-27 20:14:49]

As long as we see animations when going in or out of maximize mode this lgtm!

[bruthig, 2015-03-27 20:16:37]

The CQ bit was checked by bruthig@chromium.org

[commit-bot: I haz the power, 2015-03-27 20:17:13]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1043543002/1

[commit-bot: I haz the power, 2015-03-27 21:19:19]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-03-27 21:20:06]

Patchset 1 (id:??) landed as
https://crrev.com/bbe5bb16c1c1f1adc3ea477e2929871664f7e323
Cr-Commit-Position: refs/heads/master@{#322643}