added hybrid sdk and bootstrapped add-ons transitioning to webextensions.

embedded-webextension-sdk/step1-hybrid-addon/lib/user-data-storage.js

@@ -0,0 +1,25 @@
+const sp = require("sdk/simple-prefs");
+const ss = require("sdk/simple-storage");
+
+ss.storage.superImportantUserStoredData = "This value was saved in the simple-storage";
+
+exports.setSyncLegacyDataPort = function(port) {
+  // Send the initial data dump.
+  port.postMessage({
+    prefs: {
+      superImportantUserPref: sp.prefs["superImportantUserPref"],
+    },
+    storage: {
+      superImportantUserStoredData: ss.storage.superImportantUserStoredData,
+    },
+  });
+
+  // Keep the preferences in sync with the data stored in the webextension.
+  sp.on("superImportantUserPref", () => {
+    port.postMessage({
+      prefs: {
+        superImportantUserPref: sp.prefs["superImportantUserPref"],
+      }
+    });
+  });
+};