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diff --git a/browser/extensions/pictureinpicture/experiment-apis/pictureInPicture.js b/browser/extensions/pictureinpicture/experiment-apis/pictureInPicture.js
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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/. */
+
+"use strict";
+
+/* global AppConstants, ChromeUtils, ExtensionAPI, Services */
+
+ChromeUtils.defineESModuleGetters(this, {
+ KEYBOARD_CONTROLS: "resource://gre/modules/PictureInPictureControls.sys.mjs",
+ TOGGLE_POLICIES: "resource://gre/modules/PictureInPictureControls.sys.mjs",
+});
+
+const TOGGLE_ENABLED_PREF =
+ "media.videocontrols.picture-in-picture.video-toggle.enabled";
+
+/**
+ * This API is expected to be running in the parent process.
+ */
+this.pictureInPictureParent = class extends ExtensionAPI {
+ /**
+ * Override ExtensionAPI with PiP override's specific API
+ * Relays the site overrides to this extension's child process
+ * @param {ExtensionContext} context the context of our extension
+ * @returns {Object} returns the necessary API structure required to manage sharedData in PictureInPictureParent
+ */
+ getAPI(context) {
+ return {
+ pictureInPictureParent: {
+ setOverrides(overrides) {
+ // The Picture-in-Picture toggle is only implemented for Desktop, so make
+ // this a no-op for non-Desktop builds.
+ if (AppConstants.platform == "android") {
+ return;
+ }
+
+ Services.ppmm.sharedData.set(
+ "PictureInPicture:SiteOverrides",
+ overrides
+ );
+ },
+ },
+ };
+ }
+};
+
+/**
+ * This API is expected to be running in a content process - specifically,
+ * the WebExtension content process that the background scripts run in. We
+ * split these out so that they can return values synchronously to the
+ * background scripts.
+ */
+this.pictureInPictureChild = class extends ExtensionAPI {
+ /**
+ * Override ExtensionAPI with PiP override's specific API
+ * Clone constants into the Picture-in-Picture child process
+ * @param {ExtensionContext} context the context of our extension
+ * @returns returns the necessary API structure required to get data from PictureInPictureChild
+ */
+ getAPI(context) {
+ return {
+ pictureInPictureChild: {
+ getKeyboardControls() {
+ // The Picture-in-Picture toggle is only implemented for Desktop, so make
+ // this return nothing for non-Desktop builds.
+ if (AppConstants.platform == "android") {
+ return Cu.cloneInto({}, context.cloneScope);
+ }
+
+ return Cu.cloneInto(KEYBOARD_CONTROLS, context.cloneScope);
+ },
+ getPolicies() {
+ // The Picture-in-Picture toggle is only implemented for Desktop, so make
+ // this return nothing for non-Desktop builds.
+ if (AppConstants.platform == "android") {
+ return Cu.cloneInto({}, context.cloneScope);
+ }
+
+ return Cu.cloneInto(TOGGLE_POLICIES, context.cloneScope);
+ },
+ },
+ };
+ }
+};