Make base_unittests_apk actually work

testing/android/native_test.gyp

 # 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.
 
 {
   'conditions': [
     ['OS=="android"', {
       'targets': [
         {
+          # GN: //testing/android:native_test_native_code
           'target_name': 'native_test_native_code',
           'message': 'building native pieces of native test package',
           'type': 'static_library',
           'sources': [
             'native_test_launcher.cc',
           ],
           'direct_dependent_settings': {
             'ldflags!': [
               # JNI_OnLoad is implemented in a .a and we need to
               # re-export in the .so.
               '-Wl,--exclude-libs=ALL',
             ],
           },
           'dependencies': [
             '../../base/base.gyp:base',
             '../../base/base.gyp:test_support_base',
             '../../base/third_party/dynamic_annotations/dynamic_annotations.gyp:dynamic_annotations',
             '../gtest.gyp:gtest',
             'native_test_jni_headers',
             'native_test_util',
           ],
         },
         {
+          # GN: //testing/android:native_test_jni_headers
           'target_name': 'native_test_jni_headers',
           'type': 'none',
           'sources': [
             'java/src/org/chromium/native_test/ChromeNativeTestActivity.java'
           ],
           'variables': {
             'jni_gen_package': 'testing',
           },
           'includes': [ '../../build/jni_generator.gypi' ],
         },
         {
+          # GN: //testing/android:native_test_util
           'target_name': 'native_test_util',
           'type': 'static_library',
           'sources': [
             'native_test_util.cc',
             'native_test_util.h',
           ],
           'dependencies': [
             '../../base/base.gyp:base',
           ],
         },
       ],
     }]
   ],
 }