generate_stubs: Allow // comments as well as the existing #.

tools/generate_stubs/generate_stubs_unittest.py

Index: tools/generate_stubs/generate_stubs_unittest.py
diff --git a/tools/generate_stubs/generate_stubs_unittest.py b/tools/generate_stubs/generate_stubs_unittest.py
index 13a2bc15e59d75c9697b77807f9e1dc48451f1ad..6cea445cf0507c872ff43e496e256181b3482411 100755
--- a/tools/generate_stubs/generate_stubs_unittest.py
+++ b/tools/generate_stubs/generate_stubs_unittest.py
@@ -116,11 +116,15 @@ class GenerateStubModuleFunctionsUnittest(unittest.TestCase):
     my_sigs.append(SIMPLE_SIGNATURES[0][0])
     my_sigs.append('# a third comment')
     my_sigs.append(SIMPLE_SIGNATURES[0][0])
+    my_sigs.append('// a fourth comment')
+    my_sigs.append(SIMPLE_SIGNATURES[0][0])
+    my_sigs.append('//')
+    my_sigs.append(SIMPLE_SIGNATURES[0][0])
 
     file_contents = '\n'.join(my_sigs)
     infile = StringIO.StringIO(file_contents)
     signatures = gs.ParseSignatures(infile)
-    self.assertEqual(3, len(signatures))
+    self.assertEqual(5, len(signatures))
 
 
 class WindowsLibUnittest(unittest.TestCase):