Added tests to previously broken functionality and added null checks.

tools/dom/scripts/htmldartgenerator.py

Index: tools/dom/scripts/htmldartgenerator.py
diff --git a/tools/dom/scripts/htmldartgenerator.py b/tools/dom/scripts/htmldartgenerator.py
index 0dc105415817ab79c08e15ece11bbb821d4f9215..571e55e2b1563d6ac6cb97ccbb49ea3099dd3372 100644
--- a/tools/dom/scripts/htmldartgenerator.py
+++ b/tools/dom/scripts/htmldartgenerator.py
@@ -240,11 +240,22 @@ class HtmlDartGenerator(object):
         argument = signatures[signature_index][i]
         parameter_name = parameter_names[i]
         test_type = self._DartType(argument.type.id)
+        nullable = False or argument.type.nullable

[Anton Muhin, 2013/05/21 13:24:08]

False or?

[Andrei Mouravski, 2013/05/21 18:39:14]

I am not a smart person... :-) 

On 2013/05/21 13:24:08, Anton Muhin wrote:

+
         if test_type in ['dynamic', 'Object']:
           checks.append('?%s' % parameter_name)
         elif not can_omit_type_check(test_type, i):
+          nullable = True
           checks.append('(%s is %s || %s == null)' % (
               parameter_name, test_type, parameter_name))
+
+        if nullable is False:

[Anton Muhin, 2013/05/21 13:24:08]

nit: if not nullable

[Andrei Mouravski, 2013/05/21 18:39:14]

Done.

+          for signature in signatures:
+            if (argument not in signature or (len(signature) > i and

[Anton Muhin, 2013/05/21 13:24:08]

why still argument not in signagture check

[Andrei Mouravski, 2013/05/21 18:39:14]

Done.

+                                              signature[i] != argument)):
+              checks.append('%s != null' % parameter_name)
+              break
+
       # There can be multiple presence checks.  We need them all since a later
       # optional argument could have been passed by name, leaving 'holes'.
       checks.extend(['!?%s' % name for name in parameter_names[argument_count:]])