[bindings] Support is_explicit_nullable for method arguments.

Source/bindings/scripts/v8_methods.py

Index: Source/bindings/scripts/v8_methods.py
diff --git a/Source/bindings/scripts/v8_methods.py b/Source/bindings/scripts/v8_methods.py
index f4253981e4a1c54c1e5af8d2c26bf4a0446f0e82..9e655f3a854f6c1cb728a34352f760e4cae849f4 100644
--- a/Source/bindings/scripts/v8_methods.py
+++ b/Source/bindings/scripts/v8_methods.py
@@ -212,9 +212,13 @@ def argument_context(interface, method, argument, index):
 
     set_default_value = argument.set_default_value
     return {
-        'cpp_type': idl_type.cpp_type_args(extended_attributes=extended_attributes,
-                                           raw_type=True,
-                                           used_as_variadic_argument=argument.is_variadic),
+        'cpp_type': (
+            v8_types.cpp_template_type('Nullable', idl_type.cpp_type)
+            if idl_type.is_explicit_nullable
+            else idl_type.cpp_type_args(

[Jens Widell, 2015/03/02 07:53:13]

I think it would be better to move this call to idl_type.cpp_type_args() up,
storing the result in a variable ('this_cpp_type' is commonly used for that
purpose) and then use that variable in both branches here.

Also, the condition for using Nullable<> should also technically be
"idl_type.is_explicit_nullable and not argument.is_variadic".

+                extended_attributes=extended_attributes,
+                raw_type=True,
+                used_as_variadic_argument=argument.is_variadic)),
         'cpp_value': this_cpp_value,
         # FIXME: check that the default value's type is compatible with the argument's
         'set_default_value': set_default_value,
@@ -231,6 +235,7 @@ def argument_context(interface, method, argument, index):
         'is_callback_interface': idl_type.is_callback_interface,
         # FIXME: Remove generic 'Dictionary' special-casing
         'is_dictionary': idl_type.is_dictionary or idl_type.base_type == 'Dictionary',
+        'is_explicit_nullable': idl_type.is_explicit_nullable,
         'is_nullable': idl_type.is_nullable,
         'is_optional': argument.is_optional,
         'is_variadic': argument.is_variadic,