Use std:: versions of math functions.

The C stdlib versions always assume double types. The C++ std:: versions
are type-correct.

Change-Id: I5619339dbd2454c12ac2f35b8b2ee360b2e1a708
Bug: skia:12034
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/412666
Commit-Queue: John Stiles <johnstiles@google.com>
Auto-Submit: John Stiles <johnstiles@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
1 file changed