IDL: Support 'stringifier' keyword

Source/bindings/scripts/v8_interface.py

Index: Source/bindings/scripts/v8_interface.py
diff --git a/Source/bindings/scripts/v8_interface.py b/Source/bindings/scripts/v8_interface.py
index 9f790a3e93270d875ab485e18049850158741196..d02a30681b91071e49a64858a973716ba3c28963 100644
--- a/Source/bindings/scripts/v8_interface.py
+++ b/Source/bindings/scripts/v8_interface.py
@@ -36,6 +36,8 @@ from collections import defaultdict
 import itertools
 from operator import itemgetter
 
+import idl_definitions
+from idl_definitions import IdlOperation
 import idl_types
 from idl_types import IdlType, inherits_interface
 import v8_attributes
@@ -252,6 +254,19 @@ def interface_context(interface):
                if method.name]  # Skip anonymous special operations (methods)
     compute_method_overloads_context(methods)
 
+    # Stringifier
+    if interface.stringifier:
+        stringifier = interface.stringifier
+        method = IdlOperation()
+        method.name = 'toString'
+        method.idl_type = IdlType('DOMString')
+        method.extended_attributes.update(stringifier.extended_attributes)
+        if stringifier.attribute:
+            method.extended_attributes['ImplementedAs'] = stringifier.attribute.name
+        elif stringifier.operation:
+            method.extended_attributes['ImplementedAs'] = stringifier.operation.name
+        methods.append(v8_methods.method_context(interface, method))
+
     per_context_enabled_methods = []
     custom_registration_methods = []
     method_configuration_methods = []