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

components/dom_distiller/core/article_distillation_update.h

 // Copyright 2014 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 COMPONENTS_DOM_DISTILLER_CORE_ARTICLE_DISTILLATION_UPDATE_H_
 #define COMPONENTS_DOM_DISTILLER_CORE_ARTICLE_DISTILLATION_UPDATE_H_
 
 #include <stddef.h>
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
 #include "components/dom_distiller/core/proto/distilled_page.pb.h"
 
 namespace dom_distiller {
 
 // Update about an article that is currently under distillation.
 class ArticleDistillationUpdate {
  public:
   typedef base::RefCountedData<DistilledPageProto> RefCountedPageProto;
 
   ArticleDistillationUpdate(
       const std::vector<scoped_refptr<RefCountedPageProto> >& pages,
       bool has_next_page,
       bool has_prev_page);
+  ArticleDistillationUpdate(const ArticleDistillationUpdate& other);
   ~ArticleDistillationUpdate();
 
   // Returns the  distilled page at |index|.
   const DistilledPageProto& GetDistilledPage(size_t index) const;
 
   // Returns the size of distilled pages in this update.
   size_t GetPagesSize() const { return pages_.size(); }
 
   // Returns true, if article has a next page that is currently under
   // distillation and that is not part of the distilled pages included in this
   // update.
   bool HasNextPage() const { return has_next_page_; }
 
   // Returns true if article has a previous page that is currently under
   // distillation and that is not part of the distilled pages included in this
   // update.
   bool HasPrevPage() const { return has_prev_page_; }
 
  private:
   bool has_next_page_;
   bool has_prev_page_;
   // Currently available pages.
   std::vector<scoped_refptr<RefCountedPageProto> > pages_;
 };
 
 }  // namespace dom_distiller
 
 #endif  // COMPONENTS_DOM_DISTILLER_CORE_ARTICLE_DISTILLATION_UPDATE_H_