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. hasScheduledFrame
9. lifecycleState
10. schedulerPhase
11. schedulingStrategy
12. transientCallbackCount
13. defaultBinaryMessenger
14. hashCode
15. locked
16. runtimeType
17. window
18. Methods
19. addPersistentFrameCallback
20. addPostFrameCallback
21. addTimingsCallback
22. cancelFrameCallbackWithId
23. debugAssertNoTransientCallbacks
24. ensureFrameCallbacksRegistered
25. ensureVisualUpdate
26. handleAppLifecycleStateChanged
27. handleBeginFrame
28. handleDrawFrame
29. handleEventLoopCallback
30. initInstances
31. initServiceExtensions
32. readInitialLifecycleStateFromNativeWindow
33. removeTimingsCallback
34. resetEpoch
35. scheduleForcedFrame
36. scheduleFrame
37. scheduleFrameCallback
38. scheduleTask
39. scheduleWarmUpFrame
40. unlocked
41. createBinaryMessenger
42. evict
43. handleSystemMessage
44. initLicenses
45. lockEvents
46. noSuchMethod
47. performReassemble
48. postEvent
49. reassembleApplication
50. registerBoolServiceExtension
51. registerNumericServiceExtension
52. registerServiceExtension
53. registerSignalServiceExtension
54. registerStringServiceExtension
55. toString
56. Operators
57. operator ==
58. Static properties
59. instance
60. Static methods
61. debugPrintTransientCallbackRegistrationStack

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