Fix ClangTidy `performance-unnecessary-value-param` findings.

As before, this is only a small subset of the findings.

Change-Id: Ib5013de654cbdfd0dccebb967465c947221cbcdd
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/768297
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: John Stiles <johnstiles@google.com>
40 files changed