[Downloads] Some UMA for downloads resumption.

content/browser/download/download_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/download/download_resource_handler.h"
 
 #include <string>
 
 #include "base/bind.h"
 #include "base/logging.h"
@@ skipping 153 matching lines @@
   RecordDownloadContentDisposition(info->content_disposition);
 
   info->request_handle =
       DownloadRequestHandle(AsWeakPtr(), global_id_.child_id,
                             render_view_id_, global_id_.request_id);
 
   // Get the last modified time and etag.
   const net::HttpResponseHeaders* headers = request_->response_headers();
   if (headers) {
     std::string last_modified_hdr;
-    std::string etag;
     if (headers->EnumerateHeader(NULL, "Last-Modified", &last_modified_hdr))
       info->last_modified = last_modified_hdr;
-    if (headers->EnumerateHeader(NULL, "ETag", &etag))
-      info->etag = etag;
+    if (headers->EnumerateHeader(NULL, "ETag", &etag_))
+      info->etag = etag_;
 
     int status = headers->response_code();
     if (2 == status / 100  && status != net::HTTP_PARTIAL_CONTENT) {
       // Success & not range response; if we asked for a range, we didn't
       // get it--reset the file pointers to reflect that.
       save_info_->offset = 0;
       save_info_->hash_state = "";
     }
   }
 
@@ skipping 177 matching lines @@
       default:    // All other errors.
         // Redirection and informational codes should have been handled earlier
         // in the stack.
         DCHECK_NE(3, response_code / 100);
         DCHECK_NE(1, response_code / 100);
         reason = DOWNLOAD_INTERRUPT_REASON_SERVER_FAILED;
         break;
     }
   }
 
-  RecordAcceptsRanges(accept_ranges_, bytes_read_);
+  RecordAcceptsRanges(accept_ranges_, bytes_read_, etag_);
   RecordNetworkBlockage(
       base::TimeTicks::Now() - download_start_time_, total_pause_time_);
 
   CallStartedCB(NULL, error_code);
 
   // Send the info down the stream.  Conditional is in case we get
   // OnResponseCompleted without OnResponseStarted.
   if (stream_writer_)
     stream_writer_->Close(reason);
 
@@ skipping 95 matching lines @@
 
   // Remove output stream callback if a stream exists.
   if (stream_writer_)
     stream_writer_->RegisterCallback(base::Closure());
 
   UMA_HISTOGRAM_TIMES("SB2.DownloadDuration",
                       base::TimeTicks::Now() - download_start_time_);
 }
 
 }  // namespace content