Add kAAHairline to GpuPathRenderers

With the upcoming ccpr stroking, this will no longer be the only path
renderer that can handle hairlines.

Bug: skia:
Change-Id: I45b30ccd578bee1388a3a07a234af76a19768de6
Reviewed-on: https://skia-review.googlesource.com/142272
Commit-Queue: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/include/gpu/GrContextOptions.h b/include/gpu/GrContextOptions.h
index d2377a5..79f6503 100644
--- a/include/gpu/GrContextOptions.h
+++ b/include/gpu/GrContextOptions.h
@@ -224,7 +224,7 @@
     /**
      * Include or exclude specific GPU path renderers.
      */
-    GpuPathRenderers fGpuPathRenderers = GpuPathRenderers::kDefault;
+    GpuPathRenderers fGpuPathRenderers = GpuPathRenderers::kAll;
 
     /**
      * Disables using multiple texture units to batch multiple images into a single draw on