Add gcm, nfc and bluetooth to GN build.

components/gcm_driver.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/gcm_driver
       'target_name': 'gcm_driver',
       'type': 'static_library',
       'dependencies': [
         'os_crypt',
         '../base/base.gyp:base',
         '../google_apis/gcm/gcm.gyp:gcm',
         '../net/net.gyp:net',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+         # Note: file list duplicated in GN build.
         'gcm_driver/android/component_jni_registrar.cc',
         'gcm_driver/android/component_jni_registrar.h',
         'gcm_driver/default_gcm_app_handler.cc',
         'gcm_driver/default_gcm_app_handler.h',
         'gcm_driver/gcm_activity.cc',
         'gcm_driver/gcm_activity.h',
         'gcm_driver/gcm_app_handler.cc',
         'gcm_driver/gcm_app_handler.h',
         'gcm_driver/gcm_client.cc',
         'gcm_driver/gcm_client.h',
@@ skipping 27 matching lines @@
             'gcm_driver/gcm_client_impl.h',
             'gcm_driver/gcm_driver_desktop.cc',
             'gcm_driver/gcm_driver_desktop.h',
             'gcm_driver/gcm_stats_recorder_impl.cc',
             'gcm_driver/gcm_stats_recorder_impl.h',
           ],
         }],
       ],
     },
     {
+      # GN version: //components/gcm_driver:test_support
       'target_name': 'gcm_driver_test_support',
       'type': 'static_library',
       'dependencies': [
         'gcm_driver',
         '../base/base.gyp:base',
         '../google_apis/gcm/gcm.gyp:gcm_test_support',
         '../testing/gtest.gyp:gtest',
       ],
       'include_dirs': [
         '..',
       ],
       'sources': [
+        # Note: file list duplicated in GN build.
         'gcm_driver/fake_gcm_app_handler.cc',
         'gcm_driver/fake_gcm_app_handler.h',
         'gcm_driver/fake_gcm_client.cc',
         'gcm_driver/fake_gcm_client.h',
         'gcm_driver/fake_gcm_client_factory.cc',
         'gcm_driver/fake_gcm_client_factory.h',
         'gcm_driver/fake_gcm_driver.cc',
         'gcm_driver/fake_gcm_driver.h',
       ],
       'conditions': [
@@ skipping 37 matching lines @@
           'variables': {
             'jni_gen_package': 'components/gcm_driver',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
       ],
      },
     ],
   ],
 }