Changing the TimeDeltas in DRPPageLoadTiming to Optional

components/data_reduction_proxy.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.
 
 
 {
   'variables' :
   {
      'data_reduction_proxy_core_browser_sources' : [
         # Note: sources list duplicated in GN build.
@@ skipping 55 matching lines @@
         'data_reduction_proxy/core/common/data_reduction_proxy_bypass_action_list.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_bypass_type_list.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_config_values.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_event_creator.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_event_creator.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_event_storage_delegate.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_event_store.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_event_store.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_headers.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_headers.h',
+        'data_reduction_proxy/core/common/data_reduction_proxy_page_load_timing.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_page_load_timing.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_params.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_params.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_pref_names.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_pref_names.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_switches.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_switches.h',
         'data_reduction_proxy/core/common/data_reduction_proxy_util.cc',
         'data_reduction_proxy/core/common/data_reduction_proxy_util.h',
         'data_reduction_proxy/core/common/lofi_decider.h',
@@ skipping 206 matching lines @@
             '<@(_outputs)',
           ],
           'includes': [
             '../build/util/version.gypi',
           ],
         },
       ],
     },
   ],
 }