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* Fix a DCHECK due to a negative width when resizing the right edge past the left one, and vice versa.
* Fix the window moving when resizing its left edge past the minimum size, ditto for top edge.
* Add unit tests for above.
* Add GetMinimizeSize() method to aura::WindowDelegate interface.

BUG=104245
TEST=aura_shell_unittests, manual

Review URL: http://codereview.chromium.org/8618009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@111244 0039d316-1c4b-4281-b951-d872f2087c98