🔔 Allow android_* targets to specify proguard flags for apks

build/secondary/third_party/android_tools/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/rules.gni")
 
 config("cpu_features_include") {
   include_dirs = [ "$android_ndk_root/sources/android/cpufeatures" ]
 }
 
@@ skipping 108 matching lines @@
 android_java_prebuilt("google_play_services_default_java") {
   deps = [
     ":android_support_annotations_java",
     ":android_support_v4_java",
     ":android_support_v7_mediarouter_java",
     ":google_play_services_default_resources",
   ]
   input_jars_paths = [ "$android_sdk/optional/org.apache.http.legacy.jar" ]
   proguard_preprocess = true
   proguard_preprocess_config = "//third_party/android_tools/proguard.flags"
+  proguard_configs =
+      [ "//build/secondary/third_party/android_tools/apk_proguard.flags" ]
   jar_path = "$android_sdk_root/extras/google/google_play_services/libproject/google-play-services_lib/libs/google-play-services.jar"
 }
 
 android_aar_prebuilt("android_support_v17_leanback_java") {
   deps = [
     ":android_support_v7_recyclerview_java",
   ]
   lib_name = "leanback-v17"
   aar_path = "$lib_path/$lib_name/$lib_version/$lib_name-$lib_version.aar"
 }
 
 # TODO(jbudorick): Remove this once net_java_test_support no longer needs it.
 android_java_prebuilt("legacy_http_javalib") {
   testonly = true
   jar_path = "$android_sdk/optional/org.apache.http.legacy.jar"
 }