Create a histogram serialization mechanism in components/metrics

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,
       'base_i18n_target': 0,
     },
@@ skipping 341 matching lines @@
           'message_loop/message_pump.cc',
           'message_loop/message_pump.h',
           'message_loop/message_pump_android.cc',
           'message_loop/message_pump_android.h',
           'message_loop/message_pump_default.cc',
           'message_loop/message_pump_default.h',
           'message_loop/message_pump_ozone.cc',
           'message_loop/message_pump_ozone.h',
           'message_loop/message_pump_win.cc',
           'message_loop/message_pump_win.h',
+          'metrics/chromeos_metrics.cc',
+          'metrics/chromeos_metrics.h',
+          'metrics/metric_sample.cc',
+          'metrics/metric_sample.h',
+          'metrics/crash_sample.cc',
+          'metrics/crash_sample.h',
           'metrics/sample_map.cc',
           'metrics/sample_map.h',
           'metrics/sample_vector.cc',
           'metrics/sample_vector.h',
           'metrics/bucket_ranges.cc',
           'metrics/bucket_ranges.h',
           'metrics/histogram.cc',
           'metrics/histogram.h',
           'metrics/histogram_base.cc',
           'metrics/histogram_base.h',
           'metrics/histogram_delta_serialization.cc',
           'metrics/histogram_delta_serialization.h',
           'metrics/histogram_flattener.h',
+          'metrics/histogram_sample.cc',
+          'metrics/histogram_sample.h',
           'metrics/histogram_samples.cc',
           'metrics/histogram_samples.h',
           'metrics/histogram_snapshot_manager.cc',
           'metrics/histogram_snapshot_manager.h',
+          'metrics/linearhistogram_sample.cc',
+          'metrics/linearhistogram_sample.h',
           'metrics/sparse_histogram.cc',
           'metrics/sparse_histogram.h',
+          'metrics/sparsehistogram_sample.cc',
+          'metrics/sparsehistogram_sample.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',
           'metrics/user_metrics.cc',
           'metrics/user_metrics.h',
           'metrics/user_metrics_action.h',
+          'metrics/useraction_sample.cc',
+          'metrics/useraction_sample.cc',
           'move.h',
           'native_library.h',
           'native_library_mac.mm',
           'native_library_posix.cc',
           'native_library_win.cc',
           'nix/mime_util_xdg.cc',
           'nix/mime_util_xdg.h',
           'nix/xdg_util.cc',
           'nix/xdg_util.h',
           'observer_list.h',
@@ skipping 567 matching lines @@
           'i18n/time_formatting.h',
           'i18n/timezone.cc',
           'i18n/timezone.h',
           'i18n/utf8_validator_tables.cc',
           'i18n/utf8_validator_tables.h',
         ],
       }]
     ],
   },
 }