override new virtual onDrawDRRect in util canvas subclasses

BUG=skia:
R=robertphillips@google.com, reed@google.com

Author: reed@chromium.org

Review URL: https://codereview.chromium.org/174593003

git-svn-id: http://skia.googlecode.com/svn/trunk@13529 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/src/utils/debugger/SkDebugCanvas.h b/src/utils/debugger/SkDebugCanvas.h
index 262619e..94316d5 100644
--- a/src/utils/debugger/SkDebugCanvas.h
+++ b/src/utils/debugger/SkDebugCanvas.h
@@ -233,6 +233,9 @@
     static const int kVizImageHeight = 256;
     static const int kVizImageWidth = 256;
 
+protected:
+    virtual void onDrawDRRect(const SkRRect&, const SkRRect&, const SkPaint&) SK_OVERRIDE;
+
 private:
     SkTDArray<SkDrawCommand*> fCommandVector;
     int fWidth;