[epiphany/pgriffis/web-extension/runtime-send-message: 7/11] WebExtensions: Stub out sync storage

[Patrick Griffis <pgriffis src gnome org>]

commit 539e1fc01a25c3a7103dc54c34bde609c937af20
Author: Patrick Griffis <pgriffis igalia com>
Date:   Thu Jun 2 10:25:15 2022 -0500

    WebExtensions: Stub out sync storage

 .../resources/js/webextensions-common.js                   | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/embed/web-process-extension/resources/js/webextensions-common.js 
b/embed/web-process-extension/resources/js/webextensions-common.js
index 8aaf54819..a3b03457a 100644
--- a/embed/web-process-extension/resources/js/webextensions-common.js
+++ b/embed/web-process-extension/resources/js/webextensions-common.js
@@ -90,6 +90,20 @@ window.browser.storage = {
         clear: function () {
             return ephy_message ('storage.local.clear');
         }
+    },
+    sync: {
+        get: function (...args) {
+            return ephy_message ('storage.sync.get', args);
+        },
+        set: function (...args) {
+            return ephy_message ('storage.sync.set', args);
+        },
+        remove: function (...args) {
+            return ephy_message ('storage.sync.remove', args);
+        },
+        clear: function () {
+            return ephy_message ('storage.sync.clear');
+        }
     }
 };