Add overdraw visualization to the debugger

https://codereview.appspot.com/7267043/



git-svn-id: http://skia.googlecode.com/svn/trunk@7627 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/debugger/SkDebugger.h b/debugger/SkDebugger.h
index 6b85de3..6749ff7 100644
--- a/debugger/SkDebugger.h
+++ b/debugger/SkDebugger.h
@@ -99,6 +99,13 @@
         return fIndex;
     }
 
+    void setOverdrawViz(bool overDrawViz) {
+        if (NULL != fDebugCanvas) {
+            fDebugCanvas->setOverdrawViz(overDrawViz);
+        }
+    }
+
+
 private:
     SkDebugCanvas* fDebugCanvas;
     SkPicture* fPicture;