Rename directory: ext -> extension

extension/src/cast/contentBridge.ts

@@ -0,0 +1,19 @@
+import messaging, { Message } from "../messaging";
+import pageMessaging from "./pageMessaging";
+
+// Message port to cast manager in background script
+const managerPort = messaging.connect({ name: "cast" });
+
+const forwardToPage = (message: Message) => {
+    pageMessaging.extension.sendMessage(message);
+};
+const forwardToMain = (message: Message) => {
+    managerPort.postMessage(message);
+};
+
+managerPort.onMessage.addListener(forwardToPage);
+pageMessaging.extension.addListener(forwardToMain);
+
+managerPort.onDisconnect.addListener(() => {
+    pageMessaging.extension.close();
+});