1. Flutter
2. scheduler
3. SchedulerBinding
4. ensureFrameCallbacksRegistered method

SchedulerBinding mixin

1. Constructors
2. SchedulerBinding
3. Properties
4. currentFrameTimeStamp
5. currentSystemFrameTimeStamp
6. endOfFrame
7. framesEnabled
8. hashCode
9. hasScheduledFrame
10. lifecycleState
11. locked
12. runtimeType
13. schedulerPhase
14. schedulingStrategy
15. transientCallbackCount
16. window
17. Methods
18. addPersistentFrameCallback
19. addPostFrameCallback
20. addTimingsCallback
21. cancelFrameCallbackWithId
22. debugAssertNoTransientCallbacks
23. ensureFrameCallbacksRegistered
24. ensureVisualUpdate
25. handleAppLifecycleStateChanged
26. handleBeginFrame
27. handleDrawFrame
28. handleEventLoopCallback
29. initInstances
30. initServiceExtensions
31. lockEvents
32. noSuchMethod
33. performReassemble
34. postEvent
35. reassembleApplication
36. registerBoolServiceExtension
37. registerNumericServiceExtension
38. registerServiceExtension
39. registerSignalServiceExtension
40. registerStringServiceExtension
41. removeTimingsCallback
42. resetEpoch
43. scheduleForcedFrame
44. scheduleFrame
45. scheduleFrameCallback
46. scheduleTask
47. scheduleWarmUpFrame
48. toString
49. unlocked
50. Operators
51. operator ==
52. Static properties
53. instance
54. Static methods
55. debugPrintTransientCallbackRegistrationStack

@protected
void ensureFrameCallbacksRegistered() {
  window.onBeginFrame ??= _handleBeginFrame;
  window.onDrawFrame ??= _handleDrawFrame;
}