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
Support view() notation for animation-timeline: `<view()> = view( [ <axis> || <'view-timeline-inset'> ]? )` We move AnimationTimeline and its related types into the generics folder, and define two new structs for scroll() and view(). Note: 1. The syntax of scroll() doesn't match the current version of the spec. I will update it in Bug 1814444. 2. We will handle the creation/usage of the Anonymous View Progress Timelines in the next patch. Differential Revision: https://phabricator.services.mozilla.com/D173904