Allow test and unittest_apk GN targets to use proguard

build/config/android/rules.gni

 # 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.
 
 import("//base/android/linker/config.gni")
 import("//build/config/android/config.gni")
 import("//build/config/android/internal_rules.gni")
 import("//build/config/sanitizers/sanitizers.gni")
 import("//build/toolchain/toolchain.gni")
 import("//third_party/android_platform/config.gni")
@@ skipping 2116 matching lines @@
     testonly = true
 
     assert(defined(unittests_dep), "Need unittests_dep for $target_name")
 
     test_suite_name = get_label_info(unittests_dep, "name")
 
     # This trivial assert is needed in case both unittests_binary and apk_name
     # are defined, as otherwise test_suite_name would not be used.
     assert(test_suite_name != "")
 
+    if (defined(invoker.proguard_enabled) && invoker.proguard_enabled) {
+      assert(invoker.proguard_configs != [])
+      proguard_enabled = true
+      proguard_configs += invoker.proguard_configs

[Dirk Pranke, 2016/05/24 22:07:15]

shouldn't this be "proguard_configs = invoker.proguard_configs"?

+    }
+
     if (!defined(apk_name)) {
       apk_name = test_suite_name
     }
 
     if (!defined(android_manifest)) {
       android_manifest =
           "//testing/android/native_test/java/AndroidManifest.xml"
     }
 
     if (!defined(unittests_binary)) {
@@ skipping 280 matching lines @@
       "--target",
       rebase_path(invoker.target, root_build_dir),
       "--output-directory",
       rebase_path(root_out_dir, root_build_dir),
     ]
     if (defined(invoker.flag_name)) {
       args += [ "--flag-name=${invoker.flag_name}" ]
     }
   }
 }