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This PR accomplishes many things: - Unblocks input resampling on Fuchsia - Fixes 2 frame scheduling issues resulting in wasted work and missed frames - Removes the now-defunct VsyncRecorder class - Prepares the VsyncWaiter class for the Embedder API by moving all logic out of it - Adds hundreds of lines of unittests for Fuchsia scheduling logic to validate the performance and correctness benefits