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

This is only a small subset of the findings.

Change-Id: Ia82101f5e41b1f21b53108acdc7fd8ad900ccbbe
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/768078
Reviewed-by: Jim Van Verth <jvanverth@google.com>
Commit-Queue: Jim Van Verth <jvanverth@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
38 files changed