Split generated libraries out of //build/linux

build/linux/libgio/BUILD.gn

+# Copyright 2016 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("//tools/generate_library_loader/generate_library_loader.gni")
+
+# This generates a target named "libgio".
+generate_library_loader("libgio") {
+  name = "LibGioLoader"
+  output_h = "libgio.h"
+  output_cc = "libgio_loader.cc"
+  header = "<gio/gio.h>"
+  config = "//build/linux:gio_config"
+
+  functions = [
+    "g_settings_new",
+    "g_settings_get_child",
+    "g_settings_get_string",
+    "g_settings_get_boolean",
+    "g_settings_get_int",
+    "g_settings_get_strv",
+    "g_settings_list_schemas",
+  ]
+}