Add StaleWhileRevalidateExperiment histograms.

net/net.gypi

 # 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.
 
 # This file is shared between the regular GYP build, the NaCl GYP build, and
 # the GN build. For GN support, it must have no conditionals or anything like
 # that beyond the simple one-level-deep dictionary of values.
 {
   'variables': {
     # Subset of net source files that are compiled for NaCl (net_nacl target).
@@ skipping 1287 matching lines @@
       'base/network_change_notifier_win_unittest.cc',
       'base/network_interfaces_unittest.cc',
       'base/network_quality_estimator_unittest.cc',
       'base/port_util_unittest.cc',
       'base/prioritized_dispatcher_unittest.cc',
       'base/priority_queue_unittest.cc',
       'base/registry_controlled_domains/registry_controlled_domain_unittest.cc',
       'base/sdch_dictionary_unittest.cc',
       'base/sdch_manager_unittest.cc',
       'base/static_cookie_policy_unittest.cc',
+      'base/stale_while_revalidate_experiment_domains_unittest.cc',
       'base/test_completion_callback_unittest.cc',
       'base/upload_bytes_element_reader_unittest.cc',
       'base/upload_file_element_reader_unittest.cc',
       'base/url_util_unittest.cc',
       'cert/cert_policy_enforcer_unittest.cc',
       'cert/cert_verify_proc_unittest.cc',
       'cert/cert_verify_proc_whitelist_unittest.cc',
       'cert/crl_set_unittest.cc',
       'cert/ct_log_response_parser_unittest.cc',
       'cert/ct_log_verifier_unittest.cc',
@@ skipping 594 matching lines @@
       'docs/bug-triage.md',
       'docs/bug-triage-labels.md',
       'docs/bug-triage-suggested-workflow.md',
       'docs/code-patterns.md',
       'docs/life-of-a-url-request.md',
       'sdch/README.md',
     ],
     'net_docs_output_dir': '<(PRODUCT_DIR)/net/docs',
   }
 }