Added Web Animations and regular animation blink_perf benchmarks

Add benchmark targets for the current animation implementation and the
in progress Web Animations implementation using the Animations subset of
the blink_perf tests.

BUG=309981

Review URL: https://codereview.chromium.org/34543002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@230649 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 230649