[DevTools] Always report encodedDataLength in Network.ResponseReceived.

content/browser/loader/async_resource_handler.cc

 // Copyright (c) 2012 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.
 
 #include "content/browser/loader/async_resource_handler.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/command_line.h"
@@ skipping 337 matching lines @@
     waiting_for_upload_progress_ack_ = false;
     ReportUploadProgress();
   }
 
   if (rdh_->delegate()) {
     rdh_->delegate()->OnResponseStarted(request(), info->GetContext(),
                                         response);
   }
 
   NetLogObserver::PopulateResponseInfo(request(), response);
+  response->head.encoded_data_length = request()->raw_header_size();

[mmenke, 2016/07/21 18:10:50]

Hrm...I guess you can't use request()->GetTotalReceivedBytes() here because of
mime sniffing?

[allada, 2016/07/22 17:19:32]

I tried that originally but it was returning the number of bytes at that time,
so if a server sent the headers and some content at the same time it would give
back the size of the headers + size of content received. By moving it into a
variable that is explicitly set when headers are parsed it is much more
reliable.

 
   const HostZoomMapImpl* host_zoom_map =
       static_cast<const HostZoomMapImpl*>(info->filter()->GetHostZoomMap());
 
   if (info->GetResourceType() == RESOURCE_TYPE_MAIN_FRAME && host_zoom_map) {
     const GURL& request_url = request()->url();
     int render_process_id = info->GetChildID();
     int render_view_id = info->GetRouteID();
 
     double zoom_level = host_zoom_map->GetZoomLevelForView(
@@ skipping 241 matching lines @@
   } else {
     UMA_HISTOGRAM_CUSTOM_COUNTS(
         "Net.ResourceLoader.ResponseStartToEnd.Over_512kB",
         elapsed_time, 1, 100000, 100);
   }
 
   inlining_helper_->RecordHistogram(elapsed_time);
 }
 
 }  // namespace content