IDL: Auto-declare remaining methods implied by maplike<>/setlike<>

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 8b80f3b120428d406e0f0efff62302e9c98c0a72..fbf05746a9e10400d5332731a907db557d00f78e 100644
--- a/Source/bindings/scripts/v8_interface.py
+++ b/Source/bindings/scripts/v8_interface.py
@@ -398,6 +398,52 @@ def interface_context(interface):
                                  extended_attributes=forEach_extended_attributes),
             ]
 
+            if interface.maplike:
+                key_argument = generated_argument(interface.maplike.key_type, 'key')
+                value_argument = generated_argument(interface.maplike.value_type, 'value')
+
+                implicit_methods.extend([
+                    generated_method(IdlType('boolean'), 'has',
+                                     arguments=[key_argument],
+                                     extended_attributes=used_extended_attributes),
+                    generated_method(IdlType('any'), 'get',
+                                     arguments=[key_argument],
+                                     extended_attributes=used_extended_attributes),
+                ])
+
+                if not interface.maplike.is_read_only:
+                    implicit_methods.extend([
+                        generated_method(IdlType('void'), 'clear',
+                                         extended_attributes=used_extended_attributes),
+                        generated_method(IdlType('boolean'), 'delete',
+                                         arguments=[key_argument],
+                                         extended_attributes=used_extended_attributes),
+                        generated_method(IdlType(interface.name), 'set',
+                                         arguments=[key_argument, value_argument],
+                                         extended_attributes=used_extended_attributes),
+                    ])
+
+            if interface.setlike:
+                value_argument = generated_argument(interface.setlike.value_type, 'value')
+
+                implicit_methods.extend([
+                    generated_method(IdlType('boolean'), 'has',
+                                     arguments=[value_argument],
+                                     extended_attributes=used_extended_attributes),
+                ])
+
+                if not interface.setlike.is_read_only:
+                    implicit_methods.extend([
+                        generated_method(IdlType(interface.name), 'add',
+                                         arguments=[value_argument],
+                                         extended_attributes=used_extended_attributes),
+                        generated_method(IdlType('void'), 'clear',
+                                         extended_attributes=used_extended_attributes),
+                        generated_method(IdlType('boolean'), 'delete',
+                                         arguments=[value_argument],
+                                         extended_attributes=used_extended_attributes),
+                    ])
+
             methods_by_name = {}
             for method in methods:
                 methods_by_name.setdefault(method['name'], []).append(method)
@@ -409,8 +455,7 @@ def interface_context(interface):
                 methods.append(implicit_method)
 
         # FIXME: maplike<> and setlike<> should also imply the presence of a
-        # subset of keys(), values(), entries(), forEach(), has(), get(), add(),
-        # set(), delete() and clear(), and a 'size' attribute.
+        # 'size' attribute.
 
     # Stringifier
     if interface.stringifier: