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Docked panels can be resized from all edges except the bottom.
Jianli will create a separate patch for Windows docked Panels.

This patch depends on http://codereview.chromium.org/10020057/ landing first.

BUG=None
TEST=Updated plus manual verification of resizing docked panels.

Review URL: http://codereview.chromium.org/10066032

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@132296 0039d316-1c4b-4281-b951-d872f2087c98