Ensure ValidateCopyTextureCHROMIUM consistency Moved ValidImageSizeParameters out of IsValidCopyTextureDestinationLevel to not generate two errors for a single command call. Bug: angleproject:406922380 Change-Id: Ie96e1c51743d5973f258a49aa2613d72b47e1bfb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6433915 Commit-Queue: Alexey Knyazev <lexa.knyazev@gmail.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>