tools/test.py: Add support for JUnit compatible XML output

tools/test-wrapper-gypbuild.py

Index: tools/test-wrapper-gypbuild.py
diff --git a/tools/test-wrapper-gypbuild.py b/tools/test-wrapper-gypbuild.py
index 4dd6338dc98c32ac367fb1f8afb48eb531891a9b..756436866f4da3d171efe6464b0e83292b8c75f9 100755
--- a/tools/test-wrapper-gypbuild.py
+++ b/tools/test-wrapper-gypbuild.py
@@ -123,6 +123,7 @@ def BuildOptions():
                     default=1, type="int")
   result.add_option("--noprof", help="Disable profiling support",
                     default=False)
+  result.add_option("--xmlout", help='File name of the UnitTest output')
 
   # Flags present in the original test.py that are unsupported in this wrapper:
   # -S [-> scons_flags] (we build with gyp/make, not scons)
@@ -206,6 +207,8 @@ def PassOnOptions(options):
     result += ['--shard-run=%s' % options.shard_run]
   if options.noprof:
     result += ['--noprof']
+  if options.xmlout:
+    result += ['--xmlout=%s' % options.xmlout]
   return result