[bindings] Club related constants for a runtime enabled flag in a single |if| block

Source/bindings/scripts/v8_interface.py

 # Copyright (C) 2013 Google Inc. All rights reserved.
 # coding=utf-8
 #
 # 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
@@ skipping 236 matching lines @@
         'interface_length':
             interface_length(interface, constructors + custom_constructors),
         'is_constructor_raises_exception': extended_attributes.get('RaisesException') == 'Constructor',  # [RaisesException=Constructor]
         'named_constructor': named_constructor,
         'unscopeables': sorted(unscopeables),
     })
 
     constants = [constant_context(constant, interface) for constant in interface.constants]
 
     special_getter_constants = []
-    runtime_enabled_constants = []
+    runtime_enabled_constants = dict()
     constant_configuration_constants = []
 
     for constant in constants:
         if constant['measure_as'] or constant['deprecate_as']:
             special_getter_constants.append(constant)
             continue
-        if constant['runtime_enabled_function']:
-            runtime_enabled_constants.append(constant)
+        runtime_enabled_function = constant['runtime_enabled_function']
+        if runtime_enabled_function:
+            if runtime_enabled_function not in runtime_enabled_constants:
+                runtime_enabled_constants[runtime_enabled_function] = []
+            runtime_enabled_constants[runtime_enabled_function].append(constant)
             continue
         constant_configuration_constants.append(constant)
 
     # Constants
     context.update({
         'constant_configuration_constants': constant_configuration_constants,
         'constants': constants,
         'do_not_check_constants': 'DoNotCheckConstants' in extended_attributes,
         'has_constant_configuration': any(
             not constant['runtime_enabled_function']
             for constant in constants),
-        'runtime_enabled_constants': runtime_enabled_constants,
+        'runtime_enabled_constants': sorted(runtime_enabled_constants.iteritems()),
         'special_getter_constants': special_getter_constants,
     })
 
     # Attributes
     attributes = [v8_attributes.attribute_context(interface, attribute)
                   for attribute in interface.attributes]
 
     has_conditional_attributes = any(attribute['exposed_test'] for attribute in attributes)
     if has_conditional_attributes and interface.is_partial:
         raise Exception('Conditional attributes between partial interfaces in modules and the original interfaces(%s) in core are not allowed.' % interface.name)
@@ skipping 1076 matching lines @@
 
     extended_attributes = deleter.extended_attributes
     idl_type = deleter.idl_type
     is_call_with_script_state = v8_utilities.has_extended_attribute_value(deleter, 'CallWith', 'ScriptState')
     return {
         'is_call_with_script_state': is_call_with_script_state,
         'is_custom': 'Custom' in extended_attributes,
         'is_raises_exception': 'RaisesException' in extended_attributes,
         'name': cpp_name(deleter),
     }