[canvaskit] Fix first frame measurement
[canvaskit] Fix first frame measurement

Change-Id: I4bb7f8550ee1dc73bfdc3e2e8f7138ac0c86e7a9
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/301296
Reviewed-by: Kevin Lubick <7cdab2cfab351f23814786ba39716e90eed69047@google.com>
Auto-Submit: Nathaniel Nifong <1ce561679465ea4956c6210637580cd7ba456816@google.com>

google/skia,google/skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia,google/skia,google/skia,google/skia,google/skia,aosp-mirror/platform_external_skia,aosp-mirror/platform_external_skia,google/skia