use ClipOp instead of SkRegion for clipping

src/utils/SkCanvasStack.cpp

Index: src/utils/SkCanvasStack.cpp
diff --git a/src/utils/SkCanvasStack.cpp b/src/utils/SkCanvasStack.cpp
index 87e8f653e21b624d8db922b2610312e2f8ded75c..bd6a32dbbba75d28f29055d8f38200d1ebd9724e 100644
--- a/src/utils/SkCanvasStack.cpp
+++ b/src/utils/SkCanvasStack.cpp
@@ -54,7 +54,7 @@ void SkCanvasStack::removeAll() {
 void SkCanvasStack::clipToZOrderedBounds() {
     SkASSERT(fList.count() == fCanvasData.count());
     for (int i = 0; i < fList.count(); ++i) {
-        fList[i]->clipRegion(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op);
+        fList[i]->clipRegion(fCanvasData[i].requiredClip);
     }
 }
 
@@ -99,7 +99,7 @@ void SkCanvasStack::onClipRegion(const SkRegion& deviceRgn, SkRegion::Op op) {
         deviceRgn.translate(-fCanvasData[i].origin.x(),
                             -fCanvasData[i].origin.y(), &tempRegion);
         tempRegion.op(fCanvasData[i].requiredClip, SkRegion::kIntersect_Op);
-        fList[i]->clipRegion(tempRegion, op);
+        fList[i]->legacyClipRegion(tempRegion, op);
     }
     this->SkCanvas::onClipRegion(deviceRgn, op);
 }