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A regression fix was introduced while refactoring the Tile logic in: https://codereview.chromium.org/11438009/

The App insertion animation got broke, and this CL fixes the problem. It also fixes one corner-case bug of the insertion animation.

This CL depends on https://codereview.chromium.org/11564026/.

BUG=166184

Review URL: https://chromiumcodereview.appspot.com/11566026

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@173376 0039d316-1c4b-4281-b951-d872f2087c98