Normalize droameo benchmarks to legal filenames in perf runner script

tools/testing/perf_testing/dromaeo.html

Index: tools/testing/perf_testing/dromaeo.html
diff --git a/tools/testing/perf_testing/dromaeo.html b/tools/testing/perf_testing/dromaeo.html
index 649f252fdc71c229f6f07268b2dd45e10608078a..7c12c764c4494426610542b1a61cadd279f03a71 100644
--- a/tools/testing/perf_testing/dromaeo.html
+++ b/tools/testing/perf_testing/dromaeo.html
@@ -15,11 +15,11 @@
 
 <p> Individual Dromaeo benchmark performance </p>
 
-<p> Attribute benchmarks: </p>
+<p> Attributes benchmarks: </p>
 <img src="graphs/getAttributedromaeo.png" />
 <img src="graphs/element.propertydromaeo.png" />
 <img src="graphs/setAttributedromaeo.png" />
-<img src="graphs/element.property_=_valuedromaeo.png" />
+<img src="graphs/element.property_ASSIGN_valuedromaeo.png" />
 
 <p> Modify benchmarks: </p>
 <img src="graphs/createElementdromaeo.png" />
@@ -31,14 +31,14 @@
 
 <p> Query benchmarks: </p>
 <img src="graphs/getElementByIddromaeo.png" />
-<img src="graphs/getElementById_(not_in_document)dromaeo.png" />
-<img src="graphs/getElementsByTagName(div)dromaeo.png" />
-<img src="graphs/getElementsByTagName(p)dromaeo.png" />
-<img src="graphs/getElementsByTagName(a)dromaeo.png" />
-<img src="graphs/getElementsByTagName(*)dromaeo.png" />
-<img src="graphs/getElementsByTagName_(not_in_document)dromaeo.png" />
+<img src="graphs/getElementById__not_in_document_dromaeo.png" />
+<img src="graphs/getElementsByTagName_div_dromaeo.png" />
+<img src="graphs/getElementsByTagName_p_dromaeo.png" />
+<img src="graphs/getElementsByTagName_a_dromaeo.png" />
+<img src="graphs/getElementsByTagName_ALL_dromaeo.png" />
+<img src="graphs/getElementsByTagName__not_in_document_dromaeo.png" />
 <img src="graphs/getElementsByNamedromaeo.png" />
-<img src="graphs/getElementsByName_(not_in_document)dromaeo.png" />
+<img src="graphs/getElementsByName__not_in_document_dromaeo.png" />
 
 <p> Traverse benchmarks: </p>
 <img src="graphs/firstChilddromaeo.png" />