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This CL implements a different animation for the experimental app list.
The change will allow more views to be added with a default animation
when switching the contents view.

BUG=349727

Review URL: https://codereview.chromium.org/187083004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@255812 0039d316-1c4b-4281-b951-d872f2087c98