call drawRect to try GrAARectRenderer if the path is a rect

experimental/PdfViewer/SkNulCanvas.h

Index: experimental/PdfViewer/SkNulCanvas.h
diff --git a/experimental/PdfViewer/SkNulCanvas.h b/experimental/PdfViewer/SkNulCanvas.h
index 8ec2d32d0fc70c0f78994e55d1f185246812e806..c43ea82918b5b48ecd296894aed3931b4c98369f 100644
--- a/experimental/PdfViewer/SkNulCanvas.h
+++ b/experimental/PdfViewer/SkNulCanvas.h
@@ -55,10 +55,8 @@ public:
     virtual void drawPaint(const SkPaint& paint) {}
     virtual void drawPoints(PointMode mode, size_t count, const SkPoint pts[],
                             const SkPaint& paint) {}
-    virtual void drawRect(const SkRect& rect, const SkPaint& paint) {}
     virtual void drawOval(const SkRect& oval, const SkPaint&) {}
     virtual void drawRRect(const SkRRect& rrect, const SkPaint& paint) {}
-    virtual void drawPath(const SkPath& path, const SkPaint& paint) {}
     virtual void drawBitmap(const SkBitmap& bitmap, SkScalar left, SkScalar top,
                             const SkPaint* paint = NULL) {}
     virtual void drawBitmapRectToRect(const SkBitmap& bitmap, const SkRect* src,
@@ -95,6 +93,8 @@ public:
     virtual SkDrawFilter* setDrawFilter(SkDrawFilter* filter) {return NULL;}
 
 protected:
+    virtual void onDrawRect(const SkRect& rect, const SkPaint& paint) {}
+    virtual void onDrawPath(const SkPath& path, const SkPaint& paint) {}
     virtual SkCanvas* canvasForDrawIter() {return NULL;}
     virtual SkBaseDevice* setDevice(SkBaseDevice* device) {return NULL;}