[OriginTrials] Raise an exception at compile time for OT-enabled methods

third_party/WebKit/Source/bindings/scripts/v8_methods.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 50 matching lines @@
             idl_type.is_explicit_nullable)
 
 
 def method_context(interface, method, is_visible=True):
     arguments = method.arguments
     extended_attributes = method.extended_attributes
     idl_type = method.idl_type
     is_static = method.is_static
     name = method.name
 
+    # [OriginTrialEnabled]
+    # TODO(iclelland): Allow origin trials on methods
+    # (crbug.com/621641)
+    if v8_utilities.origin_trial_feature_name(method):
+        raise Exception('[OriginTrialEnabled] cannot be specified on '
+                        'individual methods: %s.%s' % (interface.name, method.name))
+
     if is_visible:
         idl_type.add_includes_for_type(extended_attributes)
 
     this_cpp_value = cpp_value(interface, method, len(arguments))
 
     is_implemented_in_private_script = 'ImplementedInPrivateScript' in extended_attributes
     if is_implemented_in_private_script:
         includes.add('bindings/core/v8/PrivateScriptRunner.h')
         includes.add('core/frame/LocalFrame.h')
         includes.add('platform/ScriptForbiddenScope.h')
@@ skipping 383 matching lines @@
     return method.idl_type and method.idl_type.name == 'Promise'
 
 IdlOperation.returns_promise = property(method_returns_promise)
 
 
 def argument_conversion_needs_exception_state(method, argument):
     idl_type = argument.idl_type
     return (idl_type.v8_conversion_needs_exception_state or
             argument.is_variadic or
             (method.returns_promise and idl_type.is_string_type))