Add a new implementation of reduceOpsTaskSplitting

Currently this doesn't actually handle going over the memory
budget, but it does carve out space to do that later. This algorithm
can't handle everything yet but I want to get it landed for
more iteration as long as it's disabled.

Bug: skia:10877
Change-Id: I37942172345e8cfd6fc2c591a3788a10652377da
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/345168
Commit-Queue: Adlai Holler <adlai@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
Auto-Submit: Adlai Holler <adlai@google.com>
10 files changed