bindings: Supports per-member [Exposed] for attributes on prototype.

Source/bindings/templates/partial_interface.cpp

Index: Source/bindings/templates/partial_interface.cpp
diff --git a/Source/bindings/templates/partial_interface.cpp b/Source/bindings/templates/partial_interface.cpp
index 2282dd3a01534f8f4980c6ebbec88cdb7ffc2c9d..3b40e4b75e57109872cda82c4373718fdb987f66 100644
--- a/Source/bindings/templates/partial_interface.cpp
+++ b/Source/bindings/templates/partial_interface.cpp
@@ -6,12 +6,23 @@
 {% from 'interface.cpp' import install_unscopeables with context %}
 {% from 'methods.cpp' import install_conditionally_enabled_methods
         with context %}
-void {{v8_class_or_partial}}::preparePrototypeObject(v8::Isolate* isolate, v8::Local<v8::Object> prototypeObject)
+void {{v8_class_or_partial}}::preparePrototypeObject(v8::Isolate* isolate, v8::Local<v8::Object> prototypeObject, v8::Local<v8::FunctionTemplate> interfaceTemplate)
 {
-    {{v8_class}}::preparePrototypeObject(isolate, prototypeObject);
+    {{v8_class}}::preparePrototypeObject(isolate, prototypeObject, interfaceTemplate);
 {% if unscopeables %}
     {{install_unscopeables() | indent}}
 {% endif %}
+{% if has_conditional_attributes_on_prototype %}
+    ExecutionContext* context = toExecutionContext(prototypeObject->CreationContext());
+    v8::Local<v8::Signature> signature = v8::Signature::New(isolate, interfaceTemplate);
+
+    {% for attribute in attributes if attribute.exposed_test and attribute.on_prototype %}
+    {% filter exposed(attribute.exposed_test) %}
+    static const V8DOMConfiguration::AccessorConfiguration accessorConfiguration = {{attribute_configuration(attribute)}};
+    V8DOMConfiguration::installAccessor(isolate, v8::Local<v8::Object>(), prototypeObject, v8::Local<v8::Function>(), signature, accessorConfiguration);
+    {% endfilter %}
+    {% endfor %}
+{% endif %}
 {% if conditionally_enabled_methods %}
     {{install_conditionally_enabled_methods() | indent}}
 {% endif %}