Skeleton code of SparseHistogram

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 239 matching lines @@
           'message_pump_win.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_flattener.h',
           'metrics/histogram_snapshot_manager.cc',
           'metrics/histogram_snapshot_manager.h',
+          'metrics/sparse_histogram.cc',
+          'metrics/sparse_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',
@@ skipping 408 matching lines @@
           # Remove all unnecessary files for build_nexe.py to avoid exceeding
           # command-line-string limitation when building NaCl on Windows.
           ['OS == "win" and >(nacl_untrusted_build)==1', {
               'sources/': [ ['exclude', '\\.h$'] ],
           }],
         ],
       }],
     ],
   },
 }