Revert of change mapRectScaleTranslate to pass args/ret by value

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 23442779ce0406f403436c33560ac6fc7d15a970..0ce97fff20661f8e2c82aacb801d2bb1cf574718 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -75,11 +75,13 @@
     }
 
     if (rect) {
-        const SkMatrix& ctm = this->getTotalMatrix();
-        if (!ctm.isScaleTranslate()) {
+        if (!this->getTotalMatrix().isScaleTranslate()) {
             return false; // conservative
         }
-        if (!ctm.mapRectScaleTranslate(*rect).contains(bounds)) {
+
+        SkRect devRect;
+        this->getTotalMatrix().mapRectScaleTranslate(&devRect, *rect);
+        if (!devRect.contains(bounds)) {
             return false;
         }
     }
@@ -1542,7 +1544,8 @@
     // Check if we can quick-accept the clip call (and do nothing)
     //
     if (SkRegion::kIntersect_Op == op && !doAA && fMCRec->fMatrix.isScaleTranslate()) {
-        SkRect devR = fMCRec->fMatrix.mapRectScaleTranslate(rect);
+        SkRect devR;
+        fMCRec->fMatrix.mapRectScaleTranslate(&devR, rect);
         // NOTE: this check is CTM specific, since we might round differently with a different
         //       CTM. Thus this is only 100% reliable if there is not global CTM scale to be
         //       applied later (i.e. if this is going into a picture).
@@ -1582,7 +1585,7 @@
     const bool isScaleTrans = fMCRec->fMatrix.isScaleTranslate();
     SkRect devR;
     if (isScaleTrans) {
-        devR = fMCRec->fMatrix.mapRectScaleTranslate(rect);
+        fMCRec->fMatrix.mapRectScaleTranslate(&devR, rect);
     }
 
 #ifndef SK_SUPPORT_PRECHECK_CLIPRECT