Gin: Add support for binding JS methods to C++ instance methods.

gin/object_template_builder.cc

Index: gin/object_template_builder.cc
diff --git a/gin/object_template_builder.cc b/gin/object_template_builder.cc
index 3a148e77818b363445a4dcf2aae72c6b988bd76a..6dc6d2fe849d51fc7f7446e3ec3be85de2d568ac 100644
--- a/gin/object_template_builder.cc
+++ b/gin/object_template_builder.cc
@@ -19,6 +19,14 @@ ObjectTemplateBuilder& ObjectTemplateBuilder::SetImpl(
   return *this;
 }
 
+ObjectTemplateBuilder& ObjectTemplateBuilder::SetPropertyImpl(
+    const base::StringPiece& name, v8::Handle<v8::FunctionTemplate> getter,
+    v8::Handle<v8::FunctionTemplate> setter) {
+  template_->SetAccessorProperty(StringToSymbol(isolate_, name), getter,
+                                 setter);
+  return *this;
+}
+
 v8::Local<v8::ObjectTemplate> ObjectTemplateBuilder::Build() {
   v8::Local<v8::ObjectTemplate> result = template_;
   template_.Clear();