Pipe ReducedOpsTaskSplitting into skpbench.py

This ought to help!

Bug: skia:10877
Change-Id: I8265c26dc4146ab78c125f27b533915cfb61aae8
Cq-Include-Trybots: luci.skia.skia.primary:Perf-Android-Clang-Pixel4XL-GPU-Adreno640-arm64-Release-All-Android_Vulkan_ReduceOpsTaskSplitting_Skpbench,Perf-Android-Clang-Pixel4XL-GPU-Adreno640-arm64-Release-All-Android_ReduceOpsTaskSplitting_Skpbench,Test-Debian10-Clang-NUC7i5BNK-GPU-IntelIris640-x86_64-Debug-All-ASAN_ReduceOpsTaskSplitting_Vulkan
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/369756
Commit-Queue: Adlai Holler <adlai@google.com>
Auto-Submit: Adlai Holler <adlai@google.com>
Reviewed-by: Greg Daniel <egdaniel@google.com>
4 files changed