Add convenience overload of SkPointPriv::SetRectTriStrip that takes SkRect

Change-Id: Idf5bfafaf19c20f074f12d706b8b8984c5935e6d
Reviewed-on: https://skia-review.googlesource.com/129185
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/ops/GrRegionOp.cpp b/src/gpu/ops/GrRegionOp.cpp
index c8d82da..5f63f09 100644
--- a/src/gpu/ops/GrRegionOp.cpp
+++ b/src/gpu/ops/GrRegionOp.cpp
@@ -35,8 +35,7 @@
     while (!iter.done()) {
         SkRect rect = SkRect::Make(iter.rect());
         SkPoint* position = (SkPoint*)verts;
-        SkPointPriv::SetRectTriStrip(position, rect.fLeft, rect.fTop, rect.fRight, rect.fBottom,
-                vertexStride);
+        SkPointPriv::SetRectTriStrip(position, rect, vertexStride);
 
         static const int kColorOffset = sizeof(SkPoint);
         GrColor* vertColor = reinterpret_cast<GrColor*>(verts + kColorOffset);