Refactors animation to allow for cleaner subclassing. I'm doing this
for creating a different animation subclass (which you'll see
shortly).

BUG=none
TEST=none

Review URL: http://codereview.chromium.org/1961001

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@46433 0039d316-1c4b-4281-b951-d872f2087c98
50 files changed