import FIREFOX_52_6_0esr_RELEASE from mozilla-esr52 hg repo

testing/web-platform/outbound/README

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+This directory is intended for web-platform-tests that should be
+upstreamed. The intent is to make this an automatic process, however
+that does not work yet.
+
+ When run they are mounted on the server under /_outbound/. Note that
+this will change when the tests are upstreamed, so using absolute URLs
+in tests should be avoided where possible.

testing/web-platform/outbound/meta/MANIFEST.json

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+{
+  "items": {
+    "helper": [],
+    "manual": [],
+    "reftest": [],
+    "stub": [],
+    "testharness": [],
+    "wdspec": []
+  },
+  "local_changes": {
+    "deleted": [],
+    "items": {}
+  },
+  "rev": null,
+  "url_base": "/_outbound/"
+}

testing/web-platform/outbound/tests/placeholder

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+# This Source Code Form is subject to the terms of the Mozilla Public
+# License, v. 2.0. If a copy of the MPL was not distributed with this
+# file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+This is a placeholder file to ensure that this directory remains
+in source control and test packages even when it is otherwise empty.