PlzNavigate: Add first version of NavigationURLLoader.

content/public/common/resource_devtools_info.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 CONTENT_COMMON_RESOURCE_DEVTOOLS_INFO_H_
 #define CONTENT_COMMON_RESOURCE_DEVTOOLS_INFO_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/strings/string_split.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
+// Note: when modifying this structure, also update DeepCopy in
+// resource_devtools_info.cc.
 struct ResourceDevToolsInfo : base::RefCounted<ResourceDevToolsInfo> {
   typedef base::StringPairs HeadersVector;
 
   CONTENT_EXPORT ResourceDevToolsInfo();
 
+  scoped_refptr<ResourceDevToolsInfo> DeepCopy() const;
+
   int32 http_status_code;
   std::string http_status_text;
   HeadersVector request_headers;
   HeadersVector response_headers;
   std::string request_headers_text;
   std::string response_headers_text;
 
  private:
   friend class base::RefCounted<ResourceDevToolsInfo>;
   CONTENT_EXPORT ~ResourceDevToolsInfo();
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_RESOURCE_DEVTOOLS_INFO_H_