[bindings] Implement an ExperimentEnabled IDL extended attribute.

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

Index: third_party/WebKit/Source/bindings/templates/utilities.cpp
diff --git a/third_party/WebKit/Source/bindings/templates/utilities.cpp b/third_party/WebKit/Source/bindings/templates/utilities.cpp
index 7f759451c7be673f3470fc20b7b8469cf318a546..cf6c14706fdc4e2c7a1a850967fc130b3686a69e 100644
--- a/third_party/WebKit/Source/bindings/templates/utilities.cpp
+++ b/third_party/WebKit/Source/bindings/templates/utilities.cpp
@@ -53,3 +53,23 @@ const char* validValues[] = {
 {% endif %}
 {{property_location_list | join(' | ')}}
 {%- endmacro %}
+
+
+{% macro check_api_experiment_internal(errorName, experiment_name) %}
+{% if experiment_name %}
+String {{errorName}};
+if (!{{experiment_name}}(executionContextFromIsolate, {{errorName}})) {
+     v8SetReturnValue(info, v8::Undefined(info.GetIsolate()));
+     Document& document = *toDocument(executionContextFromIsolate);
+     document.addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, {{errorName}}));

[haraken, 2015/12/31 12:47:22]

toDocument(executionContextFromIsolate).addConsoleMessage

[Daniel Nishi, 2016/01/04 18:56:31]

Done.

+     return;
+}
+{% endif %}
+{% endmacro %}
+
+
+{% macro check_api_experiment(member, isolate="info.GetIsolate()") -%}
+ExecutionContext* executionContextFromIsolate = currentExecutionContext({{isolate}});

[haraken, 2015/12/31 12:47:22]

executionContextFromIsolate => executionContext (or currentExecutionContext)

[Daniel Nishi, 2016/01/04 18:56:31]

Done.

+{{check_api_experiment_internal("errorMessage", member.api_experiment_enabled_per_interface) -}}
+{{check_api_experiment_internal("memberErrorMessage", member.api_experiment_enabled) -}}
+{% endmacro %}