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Reverts flutter/engine#51126 Initiated by: cbracken Reason for reverting: looks like this regressed Skia benchmarks: https://flutter-flutter-perf.skia.org/e/?keys=Xbf8dce9c233bce34d20e2280e3f1d8db&selected=commit%3D39653%26name%3D%2Carch%3Dintel%2Cbranch%3Dmaster%2Cconfig%3Ddefault%2Cdevice_type%3Dnone%2Cdevice_version%3Dnone%2Chost_type%3Dmac%2Csub_result%3DtimeToFirstFrameRasterizedMicros%2Ctest%3Dflutter_gallery_macos__start_up%2C&xbaroffset=39569 The regression s Original PR Author: knopp Reviewed By: {cbracken} This change reverts the following previous change: Original Description: This relands the PR reverted in https://github.com/flutter/engine/pull/51095 Changes since the original PR: - The macOS embedder does not assume particular clock when calling the embedder API, but converts CAMediaTime to engine time and back (`FlutterTimeConverter`) - `FlutterVSyncWaiter` does not wait for displaylink callback during warmup frame. This should prevent `timeToFirstFrameRasterizedMicros` regressions. - When enforcing frame pacing the raster thread is not blocked. This should prevent `average_frame_rasterizer_time_millis` regressions. [C++, Objective-C, Java style guides]: https://github.com/flutter/engine/blob/main/CONTRIBUTING.md#style