Make chrome_shell_apk build

sync/sync_tests.gypi

 # Copyright 2013 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': [
     # Test support files for the 'sync_core' target.
     # GN version: //sync:test_support_sync_core
     {
       'target_name': 'test_support_sync_core',
@@ skipping 407 matching lines @@
           ],
           'sources': [
             'tools/testserver/run_sync_testserver.cc',
           ],
         },
       ],
     }],
     ['OS == "android"', {
       'targets': [
         {
+          # GN: //sync/android:sync_javatests
           'target_name': 'sync_javatests',
           'type': 'none',
           'variables': {
             'java_in_dir': '../sync/android/javatests',
           },
           'dependencies': [
             'sync_java',
             'sync_java_test_support',
             '../base/base.gyp:base_java_test_support',
           ],
           'includes': [ '../build/java.gypi' ],
         },
         {
+          # GN: //sync:sync_java_test_support
           'target_name': 'sync_java_test_support',
           'type': 'none',
           'variables': {
             'java_in_dir': '../sync/test/android/javatests',
           },
           'dependencies': [
             'sync_java',
           ],
           'includes': [ '../build/java.gypi' ],
         },
         {
+          # GN: //sync:sync_fake_server_jni_headers
           'target_name': 'sync_fake_server_jni_headers',
           'type': 'none',
           'sources': [
             '../chrome/android/sync_shell/javatests/src/chromium/chrome/browser/sync/FakeServerHelper.java',
           ],
           'variables': {
             'jni_gen_package': 'sync/test/fake_server',
             'jni_generator_ptr_type': 'long',
           },
           'includes': [ '../build/jni_generator.gypi' ],
         },
         {
+          # GN: //sync:test_support_sync_fake_server_android
           'target_name': 'test_support_sync_fake_server_android',
           'type': 'static_library',
           'dependencies': [
             'sync_fake_server_jni_headers',
             'test_support_sync_fake_server',
             '../base/base.gyp:base',
           ],
           'sources': [
             'test/fake_server/android/fake_server_helper_android.cc',
             'test/fake_server/android/fake_server_helper_android.h',
           ],
         },
-      ],
-    }],
-    ['OS == "android"', {
-      'targets': [
         {
+          # GN: //sync:sync_unit_tests_apk
           'target_name': 'sync_unit_tests_apk',
           'type': 'none',
           'dependencies': [
             'sync_unit_tests',
           ],
           'variables': {
             'test_suite_name': 'sync_unit_tests',
           },
           'includes': [ '../build/apk_test.gypi' ],
         },
       ],
     }],
   ],
 }