Derive GrMtlPipelineStateDataManager from GrUniformDataManager.

Fixes some bugs in both classes as well.

Bug: skia:10585
Change-Id: I97c4cf0a7eeb9dff8262909a4c5ef25b1e3e0d4f
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/368817
Reviewed-by: Brian Salomon <bsalomon@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
3 files changed