Move StatisticsRecorder out of histogram.cc/h for further refactoring.

base/base.gypi

 # 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.
 
 {
   'target_defaults': {
     'variables': {
       'base_target': 0,
     },
     'target_conditions': [
@@ skipping 217 matching lines @@
           'message_pump.cc',
           'message_pump.h',
           'message_pump_android.cc',
           'message_pump_android.h',
           'message_pump_default.cc',
           'message_pump_default.h',
           'message_pump_win.cc',
           'message_pump_win.h',
           'metrics/histogram.cc',
           'metrics/histogram.h',
+          'metrics/statistics_recorder.cc',
+          'metrics/statistics_recorder.h',
           'metrics/stats_counters.cc',
           'metrics/stats_counters.h',
           'metrics/stats_table.cc',
           'metrics/stats_table.h',
           'move.h',
           'native_library.h',
           'native_library_mac.mm',
           'native_library_posix.cc',
           'native_library_win.cc',
           'observer_list.h',
@@ skipping 366 matching lines @@
           ['<(chromeos)!=1 or >(nacl_untrusted_build)==1', {
             'sources/': [
               ['exclude', '^chromeos/'],
             ],
           }],
         ],
       }],
     ],
   },
 }