Revert "Remove unnecessary flush in RenderYUVAToRGBA (take 2)"

This reverts commit 223845f79241b5333782e2afa82ceeda4950ffa3.

Reason for revert: speculative revert for chrome roll

Original change's description:
> Remove unnecessary flush in RenderYUVAToRGBA (take 2)
> 
> There is no real reason to flush here. If clients need to access the results immediately they should be flushing at the API level.
> 
> A reland of: https://skia-review.googlesource.com/c/skia/+/196645
> 
> It needs to land after the Chrome CL:
> 
> https://chromium-review.googlesource.com/c/chromium/src/+/1560554 (Flush pending work after calls to YUVGrBackendTexturesToSkImage)
> 
> Change-Id: I230d7433b5c1b72d8f50fd475033c942826eda94
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/206688
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

TBR=egdaniel@google.com,bsalomon@google.com,robertphillips@google.com

Change-Id: Ib712184e8c4f03cb4da21ca5c445b37cd3d7cd90
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/207306
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
1 file changed