change signature for virtual related to saveLayer, passing SaveLayerRec

BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1533953002

NOTREECHECKS=True

Review URL: https://codereview.chromium.org/1533953002
diff --git a/include/utils/SkNoSaveLayerCanvas.h b/include/utils/SkNoSaveLayerCanvas.h
index 0cebeff..3d786c5 100644
--- a/include/utils/SkNoSaveLayerCanvas.h
+++ b/include/utils/SkNoSaveLayerCanvas.h
@@ -21,9 +21,8 @@
     {}
 
 protected:
-    virtual SaveLayerStrategy willSaveLayer(const SkRect* bounds, const SkPaint* paint,
-                                            SaveFlags flags) override {
-        this->INHERITED::willSaveLayer(bounds, paint, flags);
+    SaveLayerStrategy getSaveLayerStrategy(const SaveLayerRec& rec) override {
+        (void)this->INHERITED::getSaveLayerStrategy(rec);
         return kNoLayer_SaveLayerStrategy;
     }