▶ Define separate variable for the sdk root used to load gmscore.

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 126 matching lines @@
   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"
 }
 
 # TODO(dgn): Use the POM files instead of hardcoding the dependencies.
-gms_path = "$android_sdk_root/extras/google/m2repository/com/google/android/gms"
+gms_path = "$default_extras_android_sdk_root/extras/google/m2repository/com/google/android/gms"
 gms_version = "9.8.0"
 
 android_aar_prebuilt("google_play_services_basement_java") {
   deps = [
     ":android_support_v4_java",
   ]
   _lib_name = "play-services-basement"
   aar_path = "$gms_path/$_lib_name/$gms_version/$_lib_name-$gms_version.aar"
   input_jars_paths = [ "$android_sdk/optional/org.apache.http.legacy.jar" ]
   ignore_manifest = true
@@ skipping 73 matching lines @@
 
 android_aar_prebuilt("google_play_services_nearby_java") {
   deps = [
     ":google_play_services_base_java",
     ":google_play_services_basement_java",
   ]
   _lib_name = "play-services-nearby"
   aar_path = "$gms_path/$_lib_name/$gms_version/$_lib_name-$gms_version.aar"
   ignore_manifest = true
 }