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

gin/object_template_builder.h

 // 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.
 
 #ifndef GIN_OBJECT_TEMPLATE_BUILDER_H_
 #define GIN_OBJECT_TEMPLATE_BUILDER_H_
 
 #include <type_traits>
 
 #include "base/bind.h"
@@ skipping 71 matching lines @@
 };
 
 }  // namespace
 
 
 // ObjectTemplateBuilder provides a handy interface to creating
 // v8::ObjectTemplate instances with various sorts of properties.
 class GIN_EXPORT ObjectTemplateBuilder {
  public:
   explicit ObjectTemplateBuilder(v8::Isolate* isolate);
+  ObjectTemplateBuilder(const ObjectTemplateBuilder& other);
   ~ObjectTemplateBuilder();
 
   // It's against Google C++ style to return a non-const ref, but we take some
   // poetic license here in order that all calls to Set() can be via the '.'
   // operator and line up nicely.
   template<typename T>
   ObjectTemplateBuilder& SetValue(const base::StringPiece& name, T val) {
     return SetImpl(name, ConvertToV8(isolate_, val));
   }
 
@@ skipping 39 matching lines @@
 
   v8::Isolate* isolate_;
 
   // ObjectTemplateBuilder should only be used on the stack.
   v8::Local<v8::ObjectTemplate> template_;
 };
 
 }  // namespace gin
 
 #endif  // GIN_OBJECT_TEMPLATE_BUILDER_H_