Create embedded webextension to support settings migration

.jpmignore

@@ -0,0 +1,14 @@
+# Ignore .DS_Store files created by mac
+.*
+\#*
+*~
+
+# Ignore any zip or xpi files
+*.zip
+*.xpi
+
+/Makefile
+/build.json
+/demo/
+/legacy/
+/output/

Makefile

@@ -1,6 +1,6 @@
 build:
 	mkdir -p output
-	zip -r -FS output/bugzillajs.xpi js css icon.png icon64.png manifest.json
+	jpm xpi --dest-dir output/
 
 lint:
 	jshint .

package.json

@@ -0,0 +1,16 @@
+{
+    "title": "BugzillaJS",
+    "description": "Add features to Bugzilla.",
+    "author": "Gregory Koberger / Matthew Noorenberghe",
+    "version": "4.0.0",
+    "main": "./sdk.js",
+    "id": "jid0-NgMDcEu2B88AbzZ6ulHodW9sJzA@jetpack",
+    "engines": {
+        "firefox": ">= 52.0a1",
+        "fennec": ">= 52.0a1"
+    },
+    "permissions": {
+        "multiprocess": true
+    },
+    "hasEmbeddedWebExtension": true
+}

sdk.js

@@ -0,0 +1,17 @@
+const webext = require("sdk/webextension");
+const ss = require("sdk/simple-storage");
+
+function setSyncLegacyDataPort(port) {
+    // Send the initial data dump.
+    port.postMessage({
+        storage: ss.storage,
+    });
+};
+
+webext.startup().then(({browser}) => {
+    browser.runtime.onConnect.addListener(port => {
+        if (port.name === "sync-legacy-addon-data") {
+            setSyncLegacyDataPort(port);
+        }
+    });
+});

webextension/js/background.js

@@ -0,0 +1,21 @@
+"use strict";
+
+
+function getSDKData() {
+    // Ask to the legacy part to dump the needed data and send it back
+    // to the background page...
+    var port = browser.runtime.connect({name: "sync-legacy-addon-data"});
+    port.onMessage.addListener((msg) => {
+        if (msg) {
+            // Where it can be saved using the WebExtensions storage API.
+            browser.storage.sync.set(msg.storage);
+        }
+    });
+}
+
+browser.storage.sync.get(null).then(stored => {
+    // If we don't have any data stored then import from the SDK.
+    if (Object.keys(stored).length === 0) {
+        getSDKData();
+    }
+});

manifest.json → webextension/manifest.json

@@ -17,6 +17,10 @@
         }
     },
 
+    "background": {
+        "scripts": ["js/background.js"]
+    },
+
     "content_scripts": [
         {
             "matches": [