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This is needed for panel overflow handling. PanelOverflowStrip (to be added in another patch) will control the hover animation for all overflow panels so that they can be synchronized well. SetPanelBoundsInstantly tells the panel to change bounds instantly without animation.

BUG=none
TEST=new test

Review URL: http://codereview.chromium.org/8775022

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@112576 0039d316-1c4b-4281-b951-d872f2087c98