Add support for origin trials in workers.

third_party/WebKit/Source/bindings/templates/utilities.cpp

 {% macro v8_value_to_local_cpp_value(thing) %}
 {# This indirection is just to avoid spurious white-space lines. #}
 {{generate_v8_value_to_local_cpp_value(thing) | trim}}
 {%- endmacro %}
 
 
 {% macro generate_v8_value_to_local_cpp_value(thing) %}
 {% set item = thing.v8_value_to_local_cpp_value or thing %}
 {% if item.error_message %}
 /* {{item.error_message}} */
@@ skipping 43 matching lines @@
 {{property_location_list | join(' | ')}}
 {%- endmacro %}
 
 
 {% macro check_origin_trial(member, isolate="info.GetIsolate()") -%}
 ExecutionContext* executionContext = currentExecutionContext({{isolate}});
 String errorMessage;
 if (!{{member.origin_trial_enabled_function}}(executionContext, errorMessage)) {
     v8SetReturnValue(info, v8::Undefined(info.GetIsolate()));
     if (!errorMessage.isEmpty()) {
-        toDocument(executionContext)->addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, errorMessage));
+        executionContext->addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, errorMessage));
     }
     return;
 }
 {% endmacro %}