Update skpbench's DDL timing

Chrome is seeing some extra overhead when using DDLs for rasterization. This CL updates skpbench to try to replicate their usage of DDLs (or, at least, better illustrate the overhead of using DDLs).

Bug: skia:9455
Change-Id: I2abc7cf2d597c97d1d7a47425064c621a7ef0eb3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/275496
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
3 files changed