Set bounds for hidden overflow Panels to make panels animate to the overflow area.
Set bounds for hidden overflow Panels to make panels animate to the overflow area.

Bounds were set way higher than overflow area. Makes panels appear to disappear to
a disconnected point. Animating to overflow area creates a better visual connection
for where the panels went.

BUG=None
TEST=Existing overflow tests


Review URL: http://codereview.chromium.org/9646003

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@125730 0039d316-1c4b-4281-b951-d872f2087c98

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