[perf_skottiewasm_lottieweb] Add flag for use_gpu

If flag is true then run with headless=false and:
* --ignore-gpu-blacklist
* --enable-gpu-rasterization

NoTry: true
Bug: skia:9237
Change-Id: I8c3c40ee34fe3d3e92b41185c30afb91459a3f5e
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/227060
Reviewed-by: Florin Malita <fmalita@chromium.org>
Commit-Queue: Ravi Mistry <rmistry@google.com>
2 files changed