Retrieves a `GdkFrameTimings` object holding timing information for the current frame or a recent frame.
The `GdkFrameTimings` object may not yet be complete: see [[email protected]_complete] and [ [email protected]_history_start].
| this |
a `GdkFrameClock` |
| frame_counter |
the frame counter value identifying the frame to be received |
|
the `GdkFrameTimings` object for the specified frame, or null if it is not available |