[Android] Refactor the native test wrappers. (RELAND)

build/apk_browsertest.gypi

-# Copyright (c) 2012 The Chromium Authors. All rights reserved.
+# Copyright 2015 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.
 
 # This file is meant to be included into a target to provide a rule
-# to build APK based test suites.
+# to build APK-based browser test suites.
 #
 # To use this, create a gyp target with the following form:
 # {
 #   'target_name': 'test_suite_name_apk',
 #   'type': 'none',
 #   'variables': {
 #     'test_suite_name': 'test_suite_name',  # string
-#     'input_jars_paths': ['/path/to/test_suite.jar', ... ],  # list
+#     'java_in_dir': 'path/to/java/dir',
 #   },
 #   'includes': ['path/to/this/gypi/file'],
 # }
 #
 
 {
   'dependencies': [
     '<(DEPTH)/base/base.gyp:base_java',
     '<(DEPTH)/build/android/pylib/device/commands/commands.gyp:chromium_commands',
     '<(DEPTH)/build/android/pylib/remote/device/dummy/dummy.gyp:remote_device_dummy_apk',
     '<(DEPTH)/testing/android/appurify_support.gyp:appurify_support_java',
+    '<(DEPTH)/testing/android/native_test.gyp:native_test_java',
     '<(DEPTH)/tools/android/android_tools.gyp:android_tools',
   ],
   'conditions': [
      ['OS == "android"', {
        'variables': {
          # These are used to configure java_apk.gypi included below.
          'apk_name': '<(test_suite_name)',
          'intermediate_dir': '<(PRODUCT_DIR)/<(test_suite_name)_apk',
          'final_apk_path': '<(intermediate_dir)/<(test_suite_name)-debug.apk',
-         'java_in_dir': '<(DEPTH)/testing/android/native_test/java',
          'native_lib_target': 'lib<(test_suite_name)',
          # TODO(yfriedman, cjhopman): Support managed installs for gtests.
          'gyp_managed_install': 0,
        },
        'includes': [ 'java_apk.gypi' ],
      }],  # 'OS == "android"
   ],  # conditions
 }