diff --git a/chromium.org/unstable/notification-shell/README b/chromium.org/unstable/notification-shell/README
new file mode 100644
index 0000000..01dc8cf
--- /dev/null
+++ b/chromium.org/unstable/notification-shell/README
@@ -0,0 +1,4 @@
+Notification shell protocol
+
+Maintainers:
+Tetsui Ohkubo <tetsui@chromium.org>
diff --git a/chromium.org/unstable/notification-shell/notification-shell-unstable-v1.xml b/chromium.org/unstable/notification-shell/notification-shell-unstable-v1.xml
new file mode 100644
index 0000000..597f59a
--- /dev/null
+++ b/chromium.org/unstable/notification-shell/notification-shell-unstable-v1.xml
@@ -0,0 +1,124 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<protocol name="notification_shell_unstable_v1">
+
+  <copyright>
+    Copyright 2018 The Chromium Authors.
+
+    Permission is hereby granted, free of charge, to any person obtaining a
+    copy of this software and associated documentation files (the "Software"),
+    to deal in the Software without restriction, including without limitation
+    the rights to use, copy, modify, merge, publish, distribute, sublicense,
+    and/or sell copies of the Software, and to permit persons to whom the
+    Software is furnished to do so, subject to the following conditions:
+
+    The above copyright notice and this permission notice (including the next
+    paragraph) shall be included in all copies or substantial portions of the
+    Software.
+
+    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+    IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+    THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+    LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+    FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+    DEALINGS IN THE SOFTWARE.
+  </copyright>
+
+  <description summary="Create desktop notifications">
+    notification_shell allows clients to create desktop notification on host.
+
+    Warning! The protocol described in this file is experimental and backward
+    incompatible changes may be made. Backward compatible changes may be added
+    together with the corresponding interface version bump. Backward
+    incompatible changes are done by bumping the version number in the protocol
+    and interface names and resetting the interface version. Once the protocol
+    is to be declared stable, the 'z' prefix and the version number in the
+    protocol and interface names are removed and the interface version number is
+    reset.
+  </description>
+
+  <interface name="zcr_notification_shell_v1" version="1">
+    <description summary="A notification window">
+      An interface that is used for creating desktop notification on host.
+    </description>
+
+    <enum name="error">
+      <entry name="invalid_notification_key" value="1"
+	     summary="invalid notification key"/>
+    </enum>
+
+    <request name="create_notification">
+      <description summary="create a desktop notification from plain text">
+	Creates a desktop notification from plain text information.
+      </description>
+      <arg name="id" type="new_id" interface="zcr_notification_shell_notification_v1"/>
+      <arg name="title" type="string" />
+      <arg name="message" type="string" />
+      <arg name="display_source" type="string" summary="textual representation of who's shown the notification"/>
+      <arg name="notification_key" type="string" />
+      <arg name="buttons" type="array" summary="array of 0-terminated button title names"/>
+    </request>
+
+    <request name="get_notification_surface">
+      <description summary="create a notification surface from a surface">
+	Creates a notification_surface for the given surface, gives it the
+	notification_surface role and associated it with a notification id.
+      </description>
+      <arg name="id" type="new_id" interface="zcr_notification_shell_surface_v1"/>
+      <arg name="surface" type="object" interface="wl_surface"/>
+      <arg name="notification_key" type="string" />
+    </request>
+  </interface>
+
+  <interface name="zcr_notification_shell_surface_v1" version="1">
+    <description summary="A notification window">
+      An interface that may be implemented by a wl_surface to host
+      notification contents.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="Destroy the notification_surface">
+	Unmap and destroy the notification surface.
+      </description>
+    </request>
+
+    <request name="set_app_id">
+      <description summary="set application ID">
+	Set an application identifier for the notification surface.
+      </description>
+      <arg name="app_id" type="string"/>
+    </request>
+  </interface>
+
+  <interface name="zcr_notification_shell_notification_v1" version="1">
+    <description summary="A notification">
+	An interface that controls the notification created by create_notification.
+    </description>
+
+    <request name="destroy" type="destructor">
+      <description summary="Destroy the notification">
+	Destroys the notification object.
+      </description>
+    </request>
+
+    <request name="close">
+      <description summary="Close the notification">
+	Closes the notification. The closed event is sent after this request.
+      </description>
+    </request>
+
+    <event name="closed">
+      <description summary="Notification is closed">
+	Notifies the notification object that the notification is closed.
+      </description>
+      <arg name="by_user" type="uint" summary="1 if notification is closed by a user"/>
+    </event>
+
+    <event name="clicked">
+      <description summary="Notification is clicked">
+	Notifies the notification object that the notification or its button is clicked.
+      </description>
+      <arg name="button_index" type="int" summary="-1 if the body of the notification is cliked as opposed to a button"/>
+    </event>
+  </interface>
+</protocol>