Use a bitfield to store animatable properties.

This makes much more sense than a std::set (which is what we're currently doing).

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BUG=None

Review URL: https://codereview.chromium.org/134453004

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@244643 0039d316-1c4b-4281-b951-d872f2087c98
20 files changed