Devolve SkTwoPointConicalGradient to SkRadialGradient when possible

Blink attempts this optimization explicitly, but Skia seems like a
better home for it.

Change-Id: I2ecd8d0b4e91fbd9be6f89005319b2d9f04836ba
Reviewed-on: https://skia-review.googlesource.com/21821
Reviewed-by: Mike Reed <reed@google.com>
Commit-Queue: Florin Malita <fmalita@chromium.org>
1 file changed