binding: Supports preparePrototypeAndInterfaceObject on partial interfaces.

third_party/WebKit/Source/bindings/templates/interface.h.tmpl

Index: third_party/WebKit/Source/bindings/templates/interface.h.tmpl
diff --git a/third_party/WebKit/Source/bindings/templates/interface.h.tmpl b/third_party/WebKit/Source/bindings/templates/interface.h.tmpl
index e72747618e3b6dcd3e45258aa294dcd8ac9aa79d..5fd556837270756723971fb6b0ead30b06ad0f58 100644
--- a/third_party/WebKit/Source/bindings/templates/interface.h.tmpl
+++ b/third_party/WebKit/Source/bindings/templates/interface.h.tmpl
@@ -139,6 +139,8 @@ class {{v8_class}} {
   {% if unscopables or has_conditional_attributes_on_prototype or
         methods | conditionally_exposed(is_partial) %}
   {{exported}}static void preparePrototypeAndInterfaceObject(v8::Local<v8::Context>, const DOMWrapperWorld&, v8::Local<v8::Object> prototypeObject, v8::Local<v8::Function> interfaceObject, v8::Local<v8::FunctionTemplate> interfaceTemplate);
+  {% elif has_partial_interface %}
+  {{exported}}static void preparePrototypeAndInterfaceObject(v8::Local<v8::Context>, const DOMWrapperWorld&, v8::Local<v8::Object> prototypeObject, v8::Local<v8::Function> interfaceObject, v8::Local<v8::FunctionTemplate> interfaceTemplate) {}
   {% endif %}
   {% if has_partial_interface %}
   {{exported}}static void updateWrapperTypeInfo(InstallTemplateFunction, PreparePrototypeAndInterfaceObjectFunction);