Add some remoting targets to GN build.

components/variations.gypi

 # 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.
 
 {
   'targets': [
     {
       # GN version: //components/variations
       'target_name': 'variations',
       'type': 'static_library',
       'include_dirs': [
         '..',
       ],
       'dependencies': [
         # List of dependencies is intentionally very minimal. Please avoid
         # adding extra dependencies without first checking with OWNERS.
         '../base/base.gyp:base',
         '../third_party/mt19937ar/mt19937ar.gyp:mt19937ar',
       ],
       'sources': [
+        # Note: sources list duplicated in GN build.
         'variations/active_field_trials.cc',
         'variations/active_field_trials.h',
         'variations/android/component_jni_registrar.cc',
         'variations/android/component_jni_registrar.h',
         'variations/android/variations_associated_data_android.cc',
         'variations/android/variations_associated_data_android.h',
         'variations/caching_permuted_entropy_provider.cc',
         'variations/caching_permuted_entropy_provider.h',
         'variations/entropy_provider.cc',
         'variations/entropy_provider.h',
@@ skipping 69 matching lines @@
           ],
           'variables': {
             'jni_gen_package': 'variations',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
     }],
   ]
 }