Change mapRectScaleTranslate to pass args/ret by value

src/utils/SkDeferredCanvas.cpp

Index: src/utils/SkDeferredCanvas.cpp
diff --git a/src/utils/SkDeferredCanvas.cpp b/src/utils/SkDeferredCanvas.cpp
index 14220209cc952717a493662b1a4e7f14a64f2870..c8a37c36b7805947c5f4527ffa8f159a072f0990 100644
--- a/src/utils/SkDeferredCanvas.cpp
+++ b/src/utils/SkDeferredCanvas.cpp
@@ -200,7 +200,7 @@ void SkDeferredCanvas::flush_check(SkRect* bounds, const SkPaint* paint, unsigne
                 if (canScale) {
                     SkMatrix m;
                     rec.getConcat(&m);
-                    m.mapRectScaleTranslate(bounds, *bounds);
+                    *bounds = m.mapRectScaleTranslate(*bounds);
                 } else {
                     goto STOP;
                 }