Create a histogram serialization mechanism in components/metrics

components/components_tests.gyp

 # Copyright 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.
 
 {
   'variables': {
     # This turns on e.g. the filename-based detection of which
     # platforms to include source files on (e.g. files ending in
     # _mac.h or _mac.cc are only compiled on MacOSX).
     'chromium_code': 1,
@@ skipping 414 matching lines @@
                 'components.gyp:web_modal_test_support',
                 '../third_party/libusb/libusb.gyp:libusb',
               ],
             }],
             ['OS == "android" and gtest_target_type == "shared_library"', {
               'dependencies': [
                 '../testing/android/native_test.gyp:native_test_native_code',
               ]
             }],
             ['chromeos==1', {
+              'sources': [
+                'metrics/chromeos/metrics_utils_unittest.cc',
+              ],
               'sources!': [
                 'storage_monitor/storage_monitor_linux_unittest.cc',
               ],
               'dependencies': [
                 '../chromeos/chromeos.gyp:chromeos_test_support',
+                'components.gyp:metrics_export',
               ],
             }],
             ['OS=="linux"', {
               'dependencies': [
                 '../dbus/dbus.gyp:dbus',
                 '../device/media_transfer_protocol/media_transfer_protocol.gyp:device_media_transfer_protocol',
               ],
             }],
             ['OS=="win" and win_use_allocator_shim==1', {
               'dependencies': [
@@ skipping 246 matching lines @@
               'dependencies': [
                 '../base/allocator/allocator.gyp:allocator',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }