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diff --git a/dom/media/eme/MediaKeySystemAccessPermissionRequest.h b/dom/media/eme/MediaKeySystemAccessPermissionRequest.h
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+++ b/dom/media/eme/MediaKeySystemAccessPermissionRequest.h
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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set ts=2 sw=2 sts=2 et cindent: */
+/* 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/. */
+
+#ifndef DOM_MEDIA_EME_MEDIAKEYSYSTEMACCESSPERMISSIONREQUEST_H_
+#define DOM_MEDIA_EME_MEDIAKEYSYSTEMACCESSPERMISSIONREQUEST_H_
+
+#include "mozilla/MozPromise.h"
+#include "nsContentPermissionHelper.h"
+
+class nsGlobalWindowInner;
+
+namespace mozilla::dom {
+
+/**
+ * This class encapsulates a permission request to allow media key system
+ * access. The intention is not for this class to be used in all cases of EME,
+ * but only when we need to seek explicit approval from an application using
+ * Gecko, such as an application embedding via GeckoView.
+ *
+ * media.eme.require-app-approval should be used to gate this functionality in
+ * gecko code, and is also used as the testing pref for
+ * ContentPermissionRequestBase. I.e. CheckPromptPrefs() will respond to having
+ * `media.eme.require-app-approval.prompt.testing` and
+ * `media.eme.require-app-approval.prompt.testing.allow` being set to true or
+ * false and will return an appropriate value to allow for test code to short
+ * circuit showing a prompt. Note that the code using this class needs to call
+ * CheckPromptPrefs and implement test specific logic, it is *not* handled by
+ * this class or ContentPermissionRequestBase.
+ *
+ * Expects to be used on main thread as ContentPermissionRequestBase uses
+ * PContentPermissionRequest which is managed by PContent which is main thread
+ * to main thread communication.
+ */
+class MediaKeySystemAccessPermissionRequest
+    : public ContentPermissionRequestBase {
+ public:
+  NS_DECL_ISUPPORTS_INHERITED
+  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(
+      MediaKeySystemAccessPermissionRequest, ContentPermissionRequestBase)
+
+  using RequestPromise = MozPromise<bool, bool, true /* IsExclusive*/>;
+
+  // Create a MediaKeySystemAccessPermissionRequest.
+  // @param aWindow The window associated with this request.
+  static already_AddRefed<MediaKeySystemAccessPermissionRequest> Create(
+      nsPIDOMWindowInner* aWindow);
+
+  // Returns a promise that will be resolved if this request is allowed or
+  // rejected in the case the request is denied. If allowed the promise
+  // will resolve with true, otherwise it will resolve with false.
+  already_AddRefed<RequestPromise> GetPromise();
+
+  // Helper function that triggers the request. This function will check
+  // prefs and cancel or allow the request if the appropriate prefs are set,
+  // otherwise it will fire the request to the associated window.
+  nsresult Start();
+
+  // nsIContentPermissionRequest methods
+  NS_IMETHOD Cancel(void) override;
+  NS_IMETHOD Allow(JS::Handle<JS::Value> choices) override;
+
+ private:
+  explicit MediaKeySystemAccessPermissionRequest(nsGlobalWindowInner* aWindow);
+  ~MediaKeySystemAccessPermissionRequest();
+
+  MozPromiseHolder<RequestPromise> mPromiseHolder;
+};
+
+}  // namespace mozilla::dom
+
+#endif  // DOM_MEDIA_EME_MEDIAKEYSYSTEMACCESSPERMISSIONREQUEST_H_