PlzNavigate: Show error pages when the navigation failed before commit

content/child/web_url_request_util.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_CHILD_WEB_URL_REQUEST_UTIL_H_
 #define CONTENT_CHILD_WEB_URL_REQUEST_UTIL_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
 #include "content/common/resource_request_body.h"
 #include "content/public/common/resource_type.h"
 
 namespace blink {
+class WebURL;
 class WebURLRequest;
+struct WebURLError;
 }
 
 namespace content {
 
 CONTENT_EXPORT ResourceType WebURLRequestToResourceType(
     const blink::WebURLRequest& request);
 
 std::string GetWebURLRequestHeaders(const blink::WebURLRequest& request);
 
 int GetLoadFlagsForWebURLRequest(const blink::WebURLRequest& request);
 
 // Takes a WebURLRequest and sets the appropriate information
 // in a ResourceRequestBody structure. Returns an empty scoped_refptr
 // if the request body is not present.
 scoped_refptr<ResourceRequestBody> GetRequestBodyForWebURLRequest(
     const blink::WebURLRequest& request);
 
+// Generates a WebURLError based on |reason|.
+blink::WebURLError CreateWebURLError(const blink::WebURL& unreachable_url,
+                                     bool stale_copy_in_cache,
+                                     int reason);
+
 }  // namespace content
 
 #endif  // CONTENT_CHILD_WEB_URL_REQUEST_UTIL_H_