Reduce boilerplate when creating simple mojom::URLLoaders.

content/common/resource_request_completion_status.h

 // Copyright 2016 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_REQUEST_COMPLETION_STATUS_H_
 #define CONTENT_COMMON_RESOURCE_REQUEST_COMPLETION_STATUS_H_
 
 #include <stdint.h>
 #include <string>
 
 #include "base/time/time.h"
 #include "content/common/content_export.h"
 
 namespace content {
 
 struct CONTENT_EXPORT ResourceRequestCompletionStatus {
   ResourceRequestCompletionStatus();
   ResourceRequestCompletionStatus(
       const ResourceRequestCompletionStatus& status);
+  explicit ResourceRequestCompletionStatus(int64_t length);
+  // Sets error_code to net::OK, completition_time to base::TimeTicks::Now(),
+  // and encoded_data_length = encoded_body_length = |length|;
   ~ResourceRequestCompletionStatus();
 
   // The error code.
   int error_code = 0;
 
   // Was ignored by the request handler.
   bool was_ignored_by_handler = false;
 
   // A copy of the data requested exists in the cache.
   bool exists_in_cache = false;
 
   // Time the request completed.
   base::TimeTicks completion_time;
 
   // Total amount of data received from the network.
   int64_t encoded_data_length = 0;
 
   // The length of the response body before removing any content encodings.
   int64_t encoded_body_length = 0;
 
   // The length of the response body after decoding.
   int64_t decoded_body_length = 0;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_RESOURCE_REQUEST_COMPLETION_STATUS_H_