Merge "More conic-specific tests revealed a few conic-specific bugs. Because javascript / canvas make visualizing conics tricky, new native tools are required." into master-skia

https://skia.googlesource.com/skia/+/ef784fb7f58c9c021172045a8e0b396c81fdc425

Change-Id: I8b3b732ffd2551c8e595d9ed241281675b68b243