Adding DRP specfic UMA for FirstContentfulPaint

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.
         'data_reduction_proxy/core/browser/data_reduction_proxy_bypass_protocol.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_bypass_protocol.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_bypass_stats.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_bypass_stats.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_compression_stats.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_config.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_config.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_config_service_client.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_configurator.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_configurator.h',
+        'data_reduction_proxy/core/browser/data_reduction_proxy_data.cc',
+        'data_reduction_proxy/core/browser/data_reduction_proxy_data.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_debug_ui_service.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_delegate.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_delegate.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_interceptor.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_interceptor.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_io_data.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_io_data.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_metrics.cc',
         'data_reduction_proxy/core/browser/data_reduction_proxy_metrics.h',
         'data_reduction_proxy/core/browser/data_reduction_proxy_mutable_config_values.cc',
@@ skipping 250 matching lines @@
             '<@(_outputs)',
           ],
           'includes': [
             '../build/util/version.gypi',
           ],
         },
       ],
     },
   ],
 }