Measuring data use of different ModelTypes in Sync Service.

sync/sync.gyp

 # Copyright 2013 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': {
     'chromium_code': 1,
     # Setting these two variables allows other targets to use the
     # sync_proto_sources variable as the list of sync protocol buffer files.
     'sync_proto_sources_dir': 'protocol',
@@ skipping 419 matching lines @@
         'syncable/syncable_read_transaction.h',
         'syncable/syncable_util.cc',
         'syncable/syncable_util.h',
         'syncable/syncable_write_transaction.cc',
         'syncable/syncable_write_transaction.h',
         'syncable/transaction_observer.h',
         'syncable/write_transaction_info.cc',
         'syncable/write_transaction_info.h',
         'util/cryptographer.cc',
         'util/cryptographer.h',
+        'util/data_type_histogram.cc',
         'util/data_type_histogram.h',
         'util/encryptor.h',
         'util/extensions_activity.cc',
         'util/extensions_activity.h',
         'util/get_session_name.cc',
         'util/get_session_name.h',
         'util/get_session_name_ios.h',
         'util/get_session_name_ios.mm',
         'util/get_session_name_linux.cc',
         'util/get_session_name_linux.h',
@@ skipping 88 matching lines @@
       },
       'includes': [
         '../build/protoc.gypi'
       ],
       'defines': [
         'SYNC_IMPLEMENTATION'
       ],
     },
   ],
 }