Pass in GrContext instead of SkGpuDevice for dashing and Sk2GrPaint conversion

src/gpu/effects/GrDashingEffect.h

Index: src/gpu/effects/GrDashingEffect.h
diff --git a/src/gpu/effects/GrDashingEffect.h b/src/gpu/effects/GrDashingEffect.h
index a1c2829fb8f140058da0212c3660b0e07aa4020c..0ed1cf031e059cc772bc35b17be9f6d150cc2f72 100644
--- a/src/gpu/effects/GrDashingEffect.h
+++ b/src/gpu/effects/GrDashingEffect.h
@@ -12,13 +12,13 @@
 #include "GrTypesPriv.h"
 #include "SkPathEffect.h"
 
-class SkGpuDevice;
+class GrContext;
 
 class GrGLDashingEffect;
 class SkPath;
 
 namespace GrDashingEffect {
-    bool DrawDashLine(const SkPoint pnts[2], const SkPaint& paint, SkGpuDevice* dev);
+    bool DrawDashLine(const SkPoint pnts[2], const SkPaint& paint, GrContext* context);
 
     /**
      * An effect that renders a dashed line. It is intended to be used as a coverage effect.