Add a default implementation in metrics_default.cc of histograms methods in system_wrappers/interfac

webrtc/test/test.gyp

 # Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 # TODO(andrew): consider moving test_support to src/base/test.
 {
@@ skipping 89 matching lines @@
         'field_trial.cc',
         'field_trial.h',
       ],
       'dependencies': [
         '<(webrtc_root)/common.gyp:webrtc_common',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:field_trial_default',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
       ],
     },
     {
-      'target_name': 'histogram',
-      'type': 'static_library',
-      'sources': [
-        'histogram.cc',
-        'histogram.h',
-      ],
-      'dependencies': [
-        '<(webrtc_root)/common.gyp:webrtc_common',
-        '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
-      ],
-    },
-    {
       'target_name': 'test_main',
       'type': 'static_library',
       'sources': [
         'test_main.cc',
       ],
       'dependencies': [
         'field_trial',
-        'histogram',
         'test_support',
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/third_party/gflags/gflags.gyp:gflags',
+        '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
       ],
     },
     {
       'target_name': 'test_support',
       'type': 'static_library',
       'dependencies': [
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/testing/gmock.gyp:gmock',
         '<(webrtc_root)/base/base.gyp:gtest_prod',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
@@ skipping 28 matching lines @@
         }],
       ],
     },
     {
       # Depend on this target when you want to have test_support but also the
       # main method needed for gtest to execute!
       'target_name': 'test_support_main',
       'type': 'static_library',
       'dependencies': [
         'field_trial',
-        'histogram',
         'test_support',
         '<(DEPTH)/testing/gmock.gyp:gmock',
         '<(DEPTH)/testing/gtest.gyp:gtest',
         '<(DEPTH)/third_party/gflags/gflags.gyp:gflags',
+        '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
       ],
       'sources': [
         'run_all_unittests.cc',
         'test_suite.cc',
         'test_suite.h',
       ],
     },
     {
       # Depend on this target when you want to have test_support and a special
       # main for mac which will run your test on a worker thread and consume
@@ skipping 248 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'test_support_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }