Added example of using export helpers

export-helpers/content_scripts/export.js

@@ -0,0 +1,35 @@
+
+/*
+Define a function in the content script's scope, then export it
+into the page script's scope.
+*/
+function notify(message) {
+  chrome.runtime.sendMessage({content: "Function call: " + message});
+}
+
+window.wrappedJSObject.notify = exportFunction(notify, window);
+
+/*
+Create an object that contains functions in the content script's scope,
+then clone it into the page script's scope.
+
+Because the object contains functions, the cloneInto call must include
+the `cloneFunctions` option.
+*/
+var messenger = {
+  notify: function(message) {
+    chrome.runtime.sendMessage({content: "Object method call 1: " + message});
+  }
+};
+
+window.wrappedJSObject.messenger = cloneInto(messenger, window, {cloneFunctions: true});
+
+/*
+Create an object in the page script's scope.
+*/
+function notify2(message) {
+  chrome.runtime.sendMessage({content: "Object method call 2: " + message});
+}
+
+var messenger2 = createObjectIn(window.wrappedJSObject, {defineAs: "messenger2"});
+messenger2.notify = exportFunction(notify2, messenger2);