PlzNavigate: Add first version of NavigationURLLoader.

content/browser/frame_host/navigation_request_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_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_INFO_H_
 #define CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_INFO_H_
 
 #include <string>
 
 #include "base/basictypes.h"
+#include "content/common/content_export.h"
 #include "content/common/frame_messages.h"
 #include "content/public/common/referrer.h"
 #include "url/gurl.h"
 
 namespace content {
 
 // A struct to hold the parameters needed to start a navigation request in
 // ResourceDispatcherHost. It is initialized on the UI thread, and then passed
 // to the IO thread by a NavigationRequest object.
-struct NavigationRequestInfo {
+struct CONTENT_EXPORT NavigationRequestInfo {
   explicit NavigationRequestInfo(
       const FrameHostMsg_BeginNavigation_Params& params);
 
   const FrameHostMsg_BeginNavigation_Params navigation_params;
 
   // ---------------------------------------------------------------------------
   // The following parameters should be filled in by RenderFrameHostManager
   // before the navigation request is sent to the ResourceDispatcherHost.
 
   // Usually the URL of the document in the top-level window, which may be
   // checked by the third-party cookie blocking policy.
   GURL first_party_for_cookies;
   bool is_main_frame;
   bool parent_is_main_frame;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_FRAME_HOST_NAVIGATION_REQUEST_INFO_H_