It covers the following cases:
| From/To | `null` | `surface 0` | `surface 1` |
|-------------|--------|-------------|-------------|
| `null` | 🆖 | 📺 | 📺 |
| `surface 0` | ❌ | 🔁 | 📺 |
| `surface 1` | ❌ | 📺 | 🔁 |
Where
- 🆖 means NOP
- ❌ means
- Set `null` on FrameProcessor, effectively dropping all frames
- 📺 means
- Notify the listener of video size
- Set FrameProcessor output surface and size when MSG_SET_VIDEO_OUTPUT_SIZE is received
- 🔁 means
- Notify the listener of video size
PiperOrigin-RevId: 495477620
a09bdfe995