make the default value of numeric parameter 0, not 1, to make testing for it more natural; also allow passing string parameter to the benchmarks

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@56294 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

tests/benchmarks/bench.h

@@ -71,6 +71,14 @@ private:
  */
 long GetNumericParameter();
 
+/**
+    Get the string parameter.
+
+    Tests may use this parameter in whatever way they see fit, by default it is
+    empty but can be set to a different value by user from the command line.
+ */
+wxString GetStringParameter();
+
 } // namespace Bench
 
 /**