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

webrtc/media/media.gyp

 # Copyright (c) 2016 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.
 
 {
   'includes': [ '../build/common.gypi', ],
   'targets': [
     {
       'target_name': 'rtc_media',
       'type': 'static_library',
       'dependencies': [
         '<(webrtc_root)/base/base.gyp:rtc_base_approved',
         '<(webrtc_root)/common.gyp:webrtc_common',
         '<(webrtc_root)/webrtc.gyp:webrtc',
         '<(webrtc_root)/voice_engine/voice_engine.gyp:voice_engine',
-        '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
         '<(webrtc_root)/system_wrappers/system_wrappers.gyp:system_wrappers',
         '<(webrtc_root)/libjingle/xmllite/xmllite.gyp:rtc_xmllite',
         '<(webrtc_root)/libjingle/xmpp/xmpp.gyp:rtc_xmpp',
         '<(webrtc_root)/p2p/p2p.gyp:rtc_p2p',
       ],
       'direct_dependent_settings': {
         'include_dirs': [
           '<(libyuv_dir)/include',
         ],
       },
@@ skipping 176 matching lines @@
           'direct_dependent_settings': {
             'include_dirs': [
               '<(libyuv_dir)/include',
               '<(DEPTH)/testing/gmock/include',
             ],
           },
           'conditions': [
             ['build_libyuv==1', {
               'dependencies': ['<(DEPTH)/third_party/libyuv/libyuv.gyp:libyuv',],
             }],
+            ['OS!="android"', {
+              'dependencies': [
+                '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
+              ],
+            }],
             ['OS=="ios"', {
               # TODO(kjellander): Make the code compile without disabling these.
               # See https://bugs.chromium.org/p/webrtc/issues/detail?id=3307
               'cflags': [
                 '-Wno-unused-variable',
               ],
               'xcode_settings': {
                 'WARNING_CFLAGS': [
                   '-Wno-unused-variable',
                 ],
@@ skipping 26 matching lines @@
           'cflags_cc!': [
             '-Wnon-virtual-dtor',
           ],
         },  # target rtc_unittest_main
         {
           'target_name': 'rtc_media_unittests',
           'type': 'executable',
           'dependencies': [
             '<(webrtc_root)/base/base_tests.gyp:rtc_base_tests_utils',
             '<(webrtc_root)/media/media.gyp:rtc_media',
+            '<(webrtc_root)/system_wrappers/system_wrappers.gyp:metrics_default',
             'rtc_unittest_main',
           ],
           'sources': [
             'base/codec_unittest.cc',
             'base/rtpdataengine_unittest.cc',
             'base/rtpdump_unittest.cc',
             'base/rtputils_unittest.cc',
             'base/streamparams_unittest.cc',
             'base/turnutils_unittest.cc',
             'base/videoadapter_unittest.cc',
@@ skipping 92 matching lines @@
               'sources': [
                 'rtc_media_unittests.isolate',
               ],
             },
           ],
         }],
       ],  # conditions
     }],  # include_tests==1
   ],  # conditions
 }