[Chromecast] Use symbol_level=1 for 32-bit GCC toolchains.

build/config/android/config.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.
 
 # This file contains common system config stuff for the Android build.
 
 if (is_android) {
   import("//build_overrides/build.gni")
 
   has_chrome_android_internal =
@@ skipping 291 matching lines @@
     android_app_abi = "mips64"
   } else {
     assert(false, "Unknown Android ABI: " + current_cpu)
   }
 
   if (android_libcpp_lib_dir == "") {
     android_libcpp_lib_dir = "${android_libcpp_root}/libs/${android_app_abi}"
   }
 
   # Secondary ABI -------------------------------------------------------------
+  # android_64bit_target_cpu has been deprecated and will soon be removed. Use
+  # is_target_cpu_64bit instead (see //build/config/compiler/compiler.gni).
+  # Note: This variable cannot take the value of is_target_cpu_64bit directly,
+  # as that would cause an import loop.
+  # TODO(agrieve): Remove this variable once it's no longer used downstream.
+  # https://crbug.com/671624
   if (target_cpu == "arm64" || target_cpu == "x64" || target_cpu == "mips64el") {
     android_64bit_target_cpu = true
   } else if (target_cpu == "arm" || target_cpu == "x86" ||
              target_cpu == "mipsel") {
     android_64bit_target_cpu = false
   } else {
     assert(false, "Unknown target CPU: $target_cpu")
   }
 
   # Intentionally do not define android_app_secondary_abi_cpu and
@@ skipping 18 matching lines @@
           "//build/toolchain/android:android_${android_secondary_abi_cpu}"
     }
   }
 }
 
 declare_args() {
   # Enables used resource whitelist generation. Set for official builds only
   # as a large amount of build output is generated.
   enable_resource_whitelist_generation = is_android && is_official_build
 }