Use std::chrono for measuring timing

Bug: skia:
Change-Id: Ida239fa3b47056289d698a19a624703fe6ff3f35
Reviewed-on: https://skia-review.googlesource.com/141951
Reviewed-by: Allan MacKinnon <allanmac@google.com>
Commit-Queue: Allan MacKinnon <allanmac@google.com>
2 files changed