Allow test and unittest_apk GN targets to use proguard

testing/test.gni

 # 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.
 
 # ==============================================================================
 # TEST SETUP
 # ==============================================================================
 
 template("_gen_isolate") {
   testonly = true
@@ skipping 140 matching lines @@
         if (defined(invoker.extra_dist_files)) {
           extra_files = invoker.extra_dist_files
         }
       }
     } else {
       _library_target = "_${target_name}__library"
       _apk_target = "${target_name}_apk"
       _apk_specific_vars = [
         "android_manifest",
         "enable_multidex",
+        "proguard_configs",
+        "proguard_enabled",
         "use_default_launcher",
         "write_asset_list",
       ]
       shared_library(_library_target) {
         # Configs will always be defined since we set_defaults in BUILDCONFIG.gn.
         configs = []  # Prevent list overwriting warning.
         configs = invoker.configs
         testonly = true
 
         deps = []
@@ skipping 170 matching lines @@
     if (defined(invoker.output_name) && target_name != invoker.output_name) {
       group("${invoker.output_name}_run") {
         testonly = true
         deps = [
           ":${invoker.target_name}",
         ]
       }
     }
   }
 }