SF: Introduce VsyncTimeline to VsyncPredictor
Add the concept of timeline freezing when switching render rate. This allow us to change render rates in sync with the app and remain jank free across render rate changes. Bug: 326599221 Test: Run TouchLatency, change render rate and examine Perfetto trace Change-Id: Ibc8026434c0c1d50138299da3cb110b317604e92
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