call drawRect to try GrAARectRenderer if the path is a rect

tests/TileGridTest.cpp

Index: tests/TileGridTest.cpp
diff --git a/tests/TileGridTest.cpp b/tests/TileGridTest.cpp
index 8f5b18a6e916450cf39e72b5e76992af7ea38143..346687122092f1083259df8cc7208c1b977c2daa 100644
--- a/tests/TileGridTest.cpp
+++ b/tests/TileGridTest.cpp
@@ -25,13 +25,14 @@ public:
     MockCanvas(SkBaseDevice* device) : SkCanvas(device)
     {}
 
-    virtual void drawRect(const SkRect& rect, const SkPaint&)
+    SkTDArray<SkRect> fRects;
+
+protected:
+    virtual void onDrawRect(const SkRect& rect, const SkPaint&)
     {
         // This capture occurs before quick reject.
         fRects.push(rect);
     }
-
-    SkTDArray<SkRect> fRects;
 };
 
 class TileGridTest {