Add support for JUnit compatible XML output in the new test runner.

tools/run-tests.py

Index: tools/run-tests.py
diff --git a/tools/run-tests.py b/tools/run-tests.py
index cb64b45b0ce74b8582cd936d1f10792bf060e55a..60ed459047e61d5e1b5edd5fa98a70192e1589d5 100755
--- a/tools/run-tests.py
+++ b/tools/run-tests.py
@@ -145,6 +145,10 @@ def BuildOptions():
                     default=False, action="store_true")
   result.add_option("--warn-unused", help="Report unused rules",
                     default=False, action="store_true")
+  result.add_option("--junitout", help="File name of the JUnit output")
+  result.add_option("--junittestsuite",
+                    help="The testsuite name in the JUnit output file",
+                    default="v8tests")
   return result
 
 
@@ -332,6 +336,9 @@ def Execute(arch, mode, args, options, suites, workspace):
   try:
     start_time = time.time()
     progress_indicator = progress.PROGRESS_INDICATORS[options.progress]()
+    if options.junitout:
+      progress_indicator = progress.JUnitTestProgressIndicator(
+          progress_indicator, options.junitout, options.junittestsuite)
 
     run_networked = not options.no_network
     if not run_networked: