Pre-allocate some opList dependency list storage

There is a perf regression (mainly on the Nexus5) for the https://skia-review.googlesource.com/c/skia/+/46200 (Add method to iterate over a GrOp's GrSurfaceProxies)

This is another candidate.

Change-Id: I276ea44d899166a7d2e74f461f5a6c2c17a21cde
Reviewed-on: https://skia-review.googlesource.com/46561
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
2 files changed