Rewrite GrQuad to use separate arrays of x and y values to be Sk4f friendly.

Change-Id: Ie2ad197c5f17849fe6e034b60bc7ec18a00edb24
Reviewed-on: https://skia-review.googlesource.com/128842
Reviewed-by: Brian Osman <brianosman@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/gn/gpu.gni b/gn/gpu.gni
index a495c55..6742232 100644
--- a/gn/gpu.gni
+++ b/gn/gpu.gni
@@ -146,6 +146,7 @@
   "$_src/gpu/GrProcessorUnitTest.h",
   "$_src/gpu/GrProxyProvider.cpp",
   "$_src/gpu/GrProxyProvider.h",
+  "$_src/gpu/GrQuad.cpp",
   "$_src/gpu/GrQuad.h",
   "$_src/gpu/GrRect.h",
   "$_src/gpu/GrRectanizer.h",