Add remaining trivial targets for the Linux GN build

base/base.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 828 matching lines @@
           ],
         }],
         ['OS == "android"', {
           'sources/': [
             ['include', '^debug/proc_maps_linux_unittest\\.cc$'],
           ],
         }],
       ],  # target_conditions
     },
     {
+      # GN: //base:base_perftests
       'target_name': 'base_perftests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         'base',
         'test_support_base',
         '../testing/gtest.gyp:gtest',
       ],
       'sources': [
         'message_loop/message_pump_perftest.cc',
         'test/run_all_unittests.cc',
         'threading/thread_perftest.cc',
         '../testing/perf/perf_test.cc'
       ],
       'conditions': [
         ['OS == "android"', {
           'dependencies': [
             '../testing/android/native_test.gyp:native_test_native_code',
           ],
         }],
       ],
     },
     {
+      # GN: //base:base_i18n_perftests
       'target_name': 'base_i18n_perftests',
       'type': '<(gtest_target_type)',
       'dependencies': [
         'test_support_base',
         'test_support_perf',
         '../testing/gtest.gyp:gtest',
         'base_i18n',
         'base',
       ],
       'sources': [
@@ skipping 187 matching lines @@
           ],
           'sources': [
             'test/launcher/test_launcher_ios.cc',
           ],
         },
       ],
     }],
     ['OS!="ios"', {
       'targets': [
         {
+          # GN: //base:check_example
           'target_name': 'check_example',
           'type': 'executable',
           'sources': [
             'check_example.cc',
           ],
           'dependencies': [
             'base',
           ],
         },
         {
@@ skipping 511 matching lines @@
               'dependencies': [
                 '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }