Add m-esr52 at 52.6.0

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diff --git a/testing/web-platform/tests/tools/wptserve/docs/stash.rst b/testing/web-platform/tests/tools/wptserve/docs/stash.rst
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+Stash
+=====
+
+Object for storing cross-request state. This is unusual in that keys
+must be UUIDs, in order to prevent different clients setting the same
+key, and values are write-once, read-once to minimise the chances of
+state persisting indefinitely. The stash defines two operations;
+`put`, to add state and `take` to remove state. Furthermore, the view
+of the stash is path-specific; by default a request will only see the
+part of the stash corresponding to its own path.
+
+A typical example of using a stash to store state might be::
+
+  @handler
+  def handler(request, response):
+      # We assume this is a string representing a UUID
+      key = request.GET.first("id")
+
+      if request.method == "POST":
+          request.server.stash.put(key, "Some sample value")
+          return "Added value to stash"
+      else:
+          value = request.server.stash.take(key)
+          assert request.server.stash.take(key) is None
+          return key
+
+:mod:`Interface <stash>`
+------------------------
+
+.. automodule:: wptserve.stash
+   :members: