components: add wifi_sync component

components/wifi_sync/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.
+
+source_set("wifi_sync") {
+  sources = [
+    "wifi_security_class.h",
+  ]
+
+  deps = [
+    "//base",
+  ]
+
+  if (is_chromeos) {
+    sources += [ "wifi_security_class_chromeos.cc" ]
+  }
+}
+
+source_set("unit_tests") {
+  testonly = true
+
+  if (is_chromeos) {
+    deps = [
+      ":wifi_sync",
+      "//testing/gtest",
+    ]
+    sources = [
+      "wifi_security_class_chromeos_unittest.cc"
+    ]
+  }
+}