🍱 Create empty build targets for browserservices verification.

This is the first step in a three sided patch:
1. Create empty build targets.
2. Have downstream depend on the empty build targets.
3. Move upstream files into the build targets.

Change-Id: I81c636dca974b5561e717ce46e5a83922fddc238
Bug: 1164866
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2632652Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Peter Conn <peconn@chromium.org>
Cr-Commit-Position: refs/heads/master@{#844614}

chrome/browser/android/browserservices/DIR_METADATA

+monorail {
+  component: "UI>Browser>Mobile>TrustedWebActivities"
+}
+team_email: "mwi-team-core@google.com"
+os: ANDROID

chrome/browser/android/browserservices/OWNERS

+peconn@chromium.org
+eirage@chromium.org

chrome/browser/android/browserservices/verification/BUILD.gn

+# Copyright 2021 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")
+
+# Empty modules for a three sided patch.
+java_group("java") {
+}
+
+java_group("javatests") {
+}