isFrameRateChangeSupported
@PlatformGap(platforms = [FilamentPlatform.WEB], behavior = "returns FALSE — display frame rate switching is not supported on web; pacing is browser-managed.")
Returns whether this SwapChain supports the setFrameRate API.
When a SwapChain is newly created, the surface capability may not yet be determined by the underlying OS, in which case this returns INDETERMINATE. Once the platform completes surface connection, this method authoritatively returns TRUE or FALSE.
Return
TRUE or FALSE once known, INDETERMINATE until then