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diff --git a/dom/media/systemservices/PMedia.ipdl b/dom/media/systemservices/PMedia.ipdl
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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/. */
+
+include protocol PContent;
+
+include PBackgroundSharedTypes;
+
+include "mozilla/media/MediaChild.h";
+
+namespace mozilla {
+namespace media {
+
+[ManualDealloc, ChildImpl="Child", ParentImpl=virtual]
+protocol PMedia
+{
+  manager PContent;
+
+parent:
+  /**
+   * Requests a potentially persistent unique secret key for each principal.
+   * Has no expiry, but is cleared by age along with cookies.
+   * This is needed by mediaDevices.enumerateDevices() to produce persistent
+   * deviceIds that wont work cross-origin.
+   *
+   * If this OriginAttributes dictionary has the privateBrowsing flag set to
+   * false, a key for this origin is returned from a primary pool of temporal
+   * in-memory keys and persistent keys read from disk. If no key exists, a
+   * temporal one is created.
+   * If aPersist is true and key is temporal, the key is promoted to persistent.
+   * Once persistent, a key cannot become temporal again.
+   *
+   * If the OriginAttributes dictionary has the privateBrowsing flag set to
+   * true, a different key for this origin is returned from a secondary pool
+   * that is never persisted to disk, and aPersist is ignored.
+   */
+  async GetPrincipalKey(PrincipalInfo aPrincipal, bool aPersist) returns(nsCString aKey);
+
+  /**
+   * Clear per-orgin list of persistent deviceIds stored for enumerateDevices
+   * Fire and forget.
+   *
+   * aSinceTime - milliseconds since 1 January 1970 00:00:00 UTC. 0 = clear all
+   *
+   * aOnlyPrivateBrowsing - if true then only purge the separate in-memory
+   *                        per-origin list used in Private Browsing.
+   */
+  async SanitizeOriginKeys(uint64_t aSinceWhen, bool aOnlyPrivateBrowsing);
+
+child:
+  async __delete__();
+};
+
+} // namespace media
+} // namespace mozilla