Add components and CLD to GN build.

components/rappor.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/rappor
       'target_name': 'rappor',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         '../base/base.gyp:base',
         '../crypto/crypto.gyp:crypto',
         '../net/net.gyp:net',
         '../third_party/smhasher/smhasher.gyp:cityhash',
         'metrics',
         'variations',
       ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'rappor/bloom_filter.cc',
         'rappor/bloom_filter.h',
         'rappor/byte_vector_utils.cc',
         'rappor/byte_vector_utils.h',
         'rappor/log_uploader.cc',
         'rappor/log_uploader.h',
         'rappor/proto/rappor_metric.proto',
         'rappor/rappor_metric.cc',
         'rappor/rappor_metric.h',
         'rappor/rappor_parameters.cc',
         'rappor/rappor_parameters.h',
         'rappor/rappor_pref_names.cc',
         'rappor/rappor_pref_names.h',
         'rappor/rappor_service.cc',
         'rappor/rappor_service.h',
       ],
       'variables': {
         'proto_in_dir': 'rappor/proto',
         'proto_out_dir': 'components/rappor/proto',
       },
       'includes': [ '../build/protoc.gypi' ],
     },
   ],
 }