Change mapRectScaleTranslate to pass args/ret by value

src/utils/SkDeferredCanvas.cpp

 /*
  * Copyright 2016 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkDeferredCanvas.h"
 #include "SkDrawable.h"
 #include "SkPath.h"
@@ skipping 182 matching lines @@
                     bounds->offset(rec.fData.fTranslate.x(), rec.fData.fTranslate.y());
                     // continue to the next rec
                 } else {
                     goto STOP;
                 }
                 break;
             case kScaleTrans_Type:
                 if (canScale) {
                     SkMatrix m;
                     rec.getConcat(&m);
-                    m.mapRectScaleTranslate(bounds, *bounds);
+                    *bounds = m.mapRectScaleTranslate(*bounds);
                 } else {
                     goto STOP;
                 }
                 break;
         }
     }
 STOP:
     this->flush_le(i);
 }
 
@@ skipping 322 matching lines @@
         return true;
     }
     return false;
 }
 SkImageInfo SkDeferredCanvas::onImageInfo() const { return fCanvas->imageInfo(); }
 bool SkDeferredCanvas::onGetProps(SkSurfaceProps* props) const { return fCanvas->getProps(props); }
 void SkDeferredCanvas::onFlush() {
     this->flush_all();
     return fCanvas->flush();
 }