Animation: Re-implement LengthStyleInterpolation properties in StringKeyframe
Animation: Re-implement LengthStyleInterpolation properties in StringKeyframe

Re-implement LengthStyleInterpolation properties in string keyframe

Fixing incorrect rebase in patch
https://codereview.chromium.org/811993002/

BUG=443039

Review URL: https://codereview.chromium.org/917863004

git-svn-id: bf5cd6ccde378db821296732a091cfbcf5285fbd@190024 bbb929c8-8fbe-4397-9dbb-9b2b20218538

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