Adding feature usage count for OffscreenCanvas

third_party/WebKit/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 294 matching lines @@
 
     if constructors or custom_constructors or has_html_constructor or named_constructor:
         if interface.is_partial:
             raise Exception('[Constructor] and [NamedConstructor] MUST NOT be'
                             ' specified on partial interface definitions: '
                             '%s' % interface.name)
 
         includes.add('bindings/core/v8/V8ObjectConstructor.h')
         includes.add('core/frame/LocalDOMWindow.h')
     elif 'Measure' in extended_attributes or 'MeasureAs' in extended_attributes:
-        raise Exception('[Measure] or [MeasureAs] specified for interface without a constructor: '
-                        '%s' % interface.name)
+        if not interface.is_partial:
+            raise Exception('[Measure] or [MeasureAs] specified for interface without a constructor: '
+                            '%s' % interface.name)
 
     # [Unscopable] attributes and methods
     unscopables = []
     for attribute in interface.attributes:
         if 'Unscopable' in attribute.extended_attributes:
             unscopables.append((attribute.name, v8_utilities.runtime_enabled_function_name(attribute)))
     for method in interface.operations:
         if 'Unscopable' in method.extended_attributes:
             unscopables.append((method.name, v8_utilities.runtime_enabled_function_name(method)))
 
@@ skipping 1102 matching lines @@
     extended_attributes = deleter.extended_attributes
     is_call_with_script_state = v8_utilities.has_extended_attribute_value(deleter, 'CallWith', 'ScriptState')
     is_ce_reactions = 'CEReactions' in extended_attributes
     return {
         'is_call_with_script_state': is_call_with_script_state,
         'is_ce_reactions': is_ce_reactions,
         'is_custom': 'Custom' in extended_attributes,
         'is_raises_exception': 'RaisesException' in extended_attributes,
         'name': cpp_name(deleter),
     }