Reland of GN: Enable proguard for apks

chrome/android/BUILD.gn

 # 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("//build/config/android/config.gni")
 import("//build/config/android/rules.gni")
 import("//build_overrides/v8.gni")
 import("//chrome/android/chrome_public_apk_tmpl.gni")
 import("//chrome/version.gni")
 import("//testing/test.gni")
@@ skipping 428 matching lines @@
 
 # GYP: //chrome/android/chrome_apk.gyp:chrome_public_test_apk_manifest
 jinja_template("chrome_public_test_apk_manifest") {
   input = "javatests/AndroidManifest.xml"
   output = chrome_public_test_apk_manifest
   variables = jinja_variables
 }
 
 # GYP: //chrome/android/chrome_apk.gyp:chrome_public_test_apk
 instrumentation_test_apk("chrome_public_test_apk") {
-  # TODO(GYP,cjhopman): Does this need version code/name?
   apk_name = "ChromePublicTest"
   apk_under_test = ":chrome_public_apk"
   android_manifest = chrome_public_test_apk_manifest
   deps = [
     ":chrome_public_test_apk_manifest",
     "//chrome/android:chrome_shared_test_java",
   ]
   isolate_file = "../chrome_public_test_apk.isolate"
+  proguard_enabled = !is_debug
 }