Currently in KeyframeEffectReadOnly::processKeyframes() we parse JS keyframes into the m_parsedKeyframes member and compute blending keyframes, a KeyframeList, and store it in m_blendingKeyframes. Paving the way towards nullable targets (webkit.org/b/182741) and reading keyframes from a CSSKeyframesRule, we need to decouple those two tasks.
<rdar://problem/37678364>
Created attachment 334183 [details] Patch
Committed r228710: <https://trac.webkit.org/changeset/228710>