flutter
awesome-flutter

https://github.com/flutter/engine
macOS
shell/platform/darwin/macos/framework/Source/FlutterView.mm
windows
shell/platform/windows/window.cc
binding_handler_delegate_->OnWindowRepaint [FlutterWindowsView::ForceRedraw]
engine_->ScheduleFrame

fml/backtrace.cc

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static int Backtrace(void** symbols, int size) {
#if FML_OS_WIN
    return CaptureStackBackTrace(0, size, symbols, NULL);
#else
    return ::backtrace(symbols, size);
#endif  // FML_OS_WIN
}

impeller/entity/shaders
impeller/renderer/backend/metal
shell/common/platform_view.cc
shell/common/shell.h

Gtk/Win32/Cocoa(Metal)