gin: Add out-of-line copy ctors for complex classes.

gin/object_template_builder.cc

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "gin/object_template_builder.h"
 
 #include <stdint.h>
 
 #include "gin/interceptor.h"
 #include "gin/per_isolate_data.h"
@@ skipping 127 matching lines @@
   info.GetReturnValue().Set(v8::Local<v8::Array>::Cast(properties));
 }
 
 }  // namespace
 
 ObjectTemplateBuilder::ObjectTemplateBuilder(v8::Isolate* isolate)
     : isolate_(isolate), template_(v8::ObjectTemplate::New(isolate)) {
   template_->SetInternalFieldCount(kNumberOfInternalFields);
 }
 
+ObjectTemplateBuilder::ObjectTemplateBuilder(
+    const ObjectTemplateBuilder& other) = default;
+
 ObjectTemplateBuilder::~ObjectTemplateBuilder() {
 }
 
 ObjectTemplateBuilder& ObjectTemplateBuilder::AddNamedPropertyInterceptor() {
   template_->SetNamedPropertyHandler(&NamedPropertyGetter,
                                      &NamedPropertySetter,
                                      &NamedPropertyQuery,
                                      NULL,
                                      &NamedPropertyEnumerator);
   return *this;
@@ skipping 22 matching lines @@
   return *this;
 }
 
 v8::Local<v8::ObjectTemplate> ObjectTemplateBuilder::Build() {
   v8::Local<v8::ObjectTemplate> result = template_;
   template_.Clear();
   return result;
 }
 
 }  // namespace gin