Do not emit is dynamic/Object checks.

lib/html/scripts/systemnative.py

Index: lib/html/scripts/systemnative.py
diff --git a/lib/html/scripts/systemnative.py b/lib/html/scripts/systemnative.py
index 5c8ce40c9a61f7e3e36b4625504c078da31d0ba0..d5d19693a03d5a27b5a5620529e81fa307337dee 100644
--- a/lib/html/scripts/systemnative.py
+++ b/lib/html/scripts/systemnative.py
@@ -473,6 +473,7 @@ class DartiumBackend(object):
 
     version = [1]
     def GenerateCall(operation, argument_count, checks):
+      checks = filter(lambda e: e != 'true', checks)

[podivilov, 2012/10/30 13:28:00]

This looks sketchy. Please don't add those checks in the list.

[Anton Muhin, 2012/10/30 13:29:35]

a) that's the easier for the current solution when we populate the list with ?!
checks and it mirrors what we do for dart2js.

If you insist, I can rewrite both though.  Would probably prefer to do that as a
separate CL to ease checking if it's changed dispatcher or not.

[podivilov, 2012/10/30 13:32:58]

If I remember correctly, dart2js code was copy-pasted from here. And where is b?
:)
Yes, please.

       if checks:
         if operation.type.id != 'void':
           template = '    if ($CHECKS) {\n      return $CALL;\n    }\n'
@@ -503,8 +504,11 @@ class DartiumBackend(object):
       for i in range(0, argument_count):
         argument = operation.arguments[i]
         argument_name = argument_names[i]
-        checks[i] = '(%s is %s || %s == null)' % (
-            argument_name, self._DartType(argument.type.id), argument_name)
+        type = self._DartType(argument.type.id)
+        if type not in ['dynamic', 'Object']:
+          checks[i] = '(%s is %s || %s == null)' % (argument_name, type, argument_name)
+        else:
+          checks[i] = 'true'
       GenerateCall(operation, argument_count, checks)
 
     # TODO: Optimize the dispatch to avoid repeated checks.