Add lots of GN targets

components/metrics.gypi

 # Copyright 2014 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.
 
 {
   'targets': [
     {
+      # GN version: //components/metrics
       'target_name': 'metrics',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../third_party/zlib/zlib.gyp:zlib',
         'component_metrics_proto',
         'variations',
@@ skipping 38 matching lines @@
           ],
         }],
         ['OS=="win"', {
           'sources!': [
             'metrics/machine_id_provider_stub.cc',
           ],
         }],
       ],
     },
     {
+      # GN version: //components/metrics:net
       'target_name': 'metrics_net',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../net/net.gyp:net',
         'metrics',
       ],
       'sources': [
         'metrics/net/net_metrics_log_uploader.cc',
         'metrics/net/net_metrics_log_uploader.h',
       ],
     },
     {
       # Protobuf compiler / generator for UMA (User Metrics Analysis).
       #
-      # GN version: //component/metrics/proto:proto
+      # GN version: //components/metrics/proto:proto
       'target_name': 'component_metrics_proto',
       'type': 'static_library',
       'sources': [
         'metrics/proto/chrome_user_metrics_extension.proto',
         'metrics/proto/histogram_event.proto',
         'metrics/proto/omnibox_event.proto',
         'metrics/proto/omnibox_input_type.proto',
         'metrics/proto/perf_data.proto',
         'metrics/proto/profiler_event.proto',
         'metrics/proto/sampled_profile.proto',
         'metrics/proto/system_profile.proto',
         'metrics/proto/user_action_event.proto',
       ],
       'variables': {
         'proto_in_dir': 'metrics/proto',
         'proto_out_dir': 'components/metrics/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
     {
       # TODO(isherman): Remove all //chrome dependencies on this target, and
       # merge the files in this target with components_unittests.
+      # GN version: //components/metrics:test_support
       'target_name': 'metrics_test_support',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         'component_metrics_proto',
         'metrics',
       ],
       'export_dependent_settings': [
@@ skipping 18 matching lines @@
             'metrics/chromeos/metric_sample.h',
           ],
           'dependencies': [
             '../base/base.gyp:base',
           ],
         },
       ],
     }],
   ],
 }