Write out useful Android GN vars in a non-gradle-specific form.

build/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/rules.gni")
 
 if (enable_java_templates) {
   import("//third_party/ijar/ijar.gni")
 
   sun_tools_jar_path = "$root_gen_dir/sun_tools_jar/tools.jar"
@@ skipping 23 matching lines @@
   java_prebuilt("sun_tools_java") {
     jar_path = sun_tools_jar_path
     jar_dep = ":find_sun_tools_jar"
   }
 
   generate_interface_jar("android_ijar") {
     input_jar = android_sdk_jar
     output_jar = "$root_out_dir/lib.java/android.interface.jar"
   }
 
-  _rebased_android_sdk_root = rebase_path(android_sdk_root, root_build_dir)
-
-  # Record GN vars that are needed by generate_gradle.py.
-  # One statement per-line to make GN's formatter leave it alone.
+  # Write to a file some GN vars that are useful to scripts that use the output
+  # directory. Format is chosen as easliy importable by both python and bash.
   CR = "$0x0A"
-  _json = "{$CR"
-  _json += "  \"android_sdk_root\": \"$_rebased_android_sdk_root\",$CR"
-  _json += "  \"compile_sdk_version\": \"$android_sdk_version\",$CR"
-  _json += "  \"build_tools_version\": \"$android_sdk_build_tools_version\"$CR"
-  _json += "}$CR"
-  write_file("$root_build_dir/gradle/config.json", _json)
+  _data = ""
+  _data += "android_sdk_build_tools=" +
+           rebase_path(android_sdk_build_tools, root_build_dir) + CR
+  _data += "android_sdk_build_tools_version=$android_sdk_build_tools_version$CR"
+  _data +=
+      "android_sdk_root=" + rebase_path(android_sdk_root, root_build_dir) + CR
+  _data += "android_sdk_version=$android_sdk_version$CR"
+  write_file("$root_build_dir/build_vars.txt", _data)
 }
 
 # Copy to the lib.unstripped directory so that gdb can easily find it.
 copy("cpplib_unstripped") {
   _soname = "libc++_shared.so"
   sources = [
     "${android_libcpp_lib_dir}/${_soname}",
   ]
   outputs = [
     "${root_out_dir}/lib.unstripped/${_soname}",
@@ skipping 81 matching lines @@
   _target_name = get_path_info(script, "name") + "_wrapper"
   _wrapper_targets += [ ":$_target_name" ]
   wrapper_script(_target_name) {
     target = script
   }
 }
 
 group("wrapper_scripts") {
   deps = _wrapper_targets
 }