Record UMA statistics for file_stream operations.

net/net.gyp

 # Copyright (c) 2011 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     'linux_link_kerberos%': 0,
     'conditions': [
@@ skipping 80 matching lines @@
         'base/dns_util.cc',
         'base/dns_util.h',
         'base/dnsrr_resolver.cc',
         'base/dnsrr_resolver.h',
         'base/escape.cc',
         'base/escape.h',
         'base/escape_icu.cc',
         'base/ev_root_ca_metadata.cc',
         'base/ev_root_ca_metadata.h',
         'base/file_stream.h',
+        'base/file_stream_metrics.h',
+        'base/file_stream_metrics.cc',
+        'base/file_stream_metrics_posix.cc',
+        'base/file_stream_metrics_win.cc',
         'base/file_stream_posix.cc',
         'base/file_stream_win.cc',
         'base/filter.cc',
         'base/filter.h',
         'base/gzip_filter.cc',
         'base/gzip_filter.h',
         'base/gzip_header.cc',
         'base/gzip_header.h',
         'base/host_cache.cc',
         'base/host_cache.h',
@@ skipping 1433 matching lines @@
             'tools/dump_cache/url_to_filename_encoder.cc',
             'tools/dump_cache/url_to_filename_encoder.h',
             'tools/dump_cache/url_utilities.h',
             'tools/dump_cache/url_utilities.cc',
           ],
         },
       ],
     }],
   ],
 }