Add GN arg "enable_proguard_obfuscation"

chrome/android/chrome_public_apk_tmpl.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.
 
 import("//base/android/linker/config.gni")
 import("//build/config/android/rules.gni")
 import("//chrome/common/features.gni")
 import("//third_party/leakcanary/config.gni")
 import("channel.gni")
 
 declare_args() {
   # Whether chrome_public_apk should use the crazy linker.
   chrome_public_apk_use_chromium_linker = chromium_linker_supported
 
   # Whether chrome_public_apk should use the relocation packer.
   # TODO: Enable packed relocations for x64. See: b/20532404
   chrome_public_apk_use_relocation_packer =
       chromium_linker_supported && current_cpu != "x64"
 
   # Whether native libraries should be loaded from within the apk.
   # Only attempt loading the library from the APK for 64 bit devices
   # until the number of 32 bit devices which don't support this
   # approach falls to a minimal level -  http://crbug.com/390618.
   chrome_public_apk_load_library_from_apk =
       chromium_linker_supported &&
       (current_cpu == "arm64" || current_cpu == "x64")
+
+  # Enables ProGuard obfuscation of Chromium packages.
+  enable_proguard_obfuscation = false
 }
 
 default_chrome_public_jinja_variables = [
   "channel=$android_channel",
   "enable_leakcanary=$enable_leakcanary",
   "enable_vr_shell=$enable_vr_shell",
 ]
 
 template("chrome_public_apk_tmpl") {
   android_apk(target_name) {
     forward_variables_from(invoker, "*")
     _native_lib_file =
         rebase_path("$root_gen_dir/CHROME_VERSION.json", root_out_dir)
     native_lib_version_arg = "@FileArg($_native_lib_file:full-quoted)"
 
     if (is_java_debug) {
       enable_multidex = true
     } else {
       proguard_enabled = true
       if (!defined(proguard_configs)) {
         proguard_configs = []
       }
       proguard_configs += [
         "//chrome/android/java/proguard.flags",
         "//base/android/proguard/chromium_apk.flags",
         "//base/android/proguard/chromium_code.flags",
       ]
+      if (enable_proguard_obfuscation) {
+        proguard_configs += [ "//chrome/android/java/proguard-obfuscate.flags" ]
+      } else {
+        proguard_configs +=
+            [ "//chrome/android/java/proguard-dont-obfuscate.flags" ]
+      }
     }
 
     if (!defined(use_chromium_linker)) {
       use_chromium_linker = chrome_public_apk_use_chromium_linker
     }
 
     if (use_chromium_linker) {
       if (!defined(load_library_from_apk)) {
         load_library_from_apk = chrome_public_apk_load_library_from_apk
       }
 
       if (!defined(enable_relocation_packing)) {
         enable_relocation_packing = chrome_public_apk_use_relocation_packer
       }
     }
   }
 }