Add mole game tutorial (#1433)

LGTN

Author: oliverdunk

Diff for: functional-samples/tutorial.mole-game/README.md

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+# Mole Game
+
+This mole game is based on a YouTube tutorial in our Chrome Extensions series. Watch it [here](https://goo.gle/Chrome-Ext).
+
+<img src="mole-game.png" width=500>
+
+## Overview
+
+In the sample, moles periodically appear from pipes in the browser toolbar. You score points by clicking the icon before the mole disappears.
+
+If enabled, a browser tab is closed if you miss one of the moles.
+
+## Implementation Notes
+
+Each icon in the browser toolbar is a seperate extension. The extensions communicate using the `chrome.runtime.sendMessage` API and the `chrome.runtime.onMessageExternal` event.
+
+To discover mole extensions, the controller extension uses the `chrome.management` API.
+
+By default, the tab closing behavior is disabled. You can enable this by commenting out the line in `mole/service-worker.js`.
+
+## Running this extension
+
+1. Clone this repository.
+1. Make several copies of the `mole` directory.
+1. Load the `controller` directory and all mole directories in Chrome as [unpacked extensions](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+1. Wait for a mole to appear!

Diff for: functional-samples/tutorial.mole-game/controller/manifest.json

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+{
+  "name": "mole controller",
+  "version": "1.0",
+  "manifest_version": 3,
+  "background": {
+    "service_worker": "service-worker.js"
+  },
+  "permissions": ["management", "alarms"],
+  "action": {}
+}

Diff for: functional-samples/tutorial.mole-game/controller/service-worker.js

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+chrome.runtime.onInstalled.addListener(() => {
+  chrome.alarms.create({ periodInMinutes: (1 / 60) * 3 });
+});
+
+chrome.alarms.onAlarm.addListener(async () => {
+  const extensions = await chrome.management.getAll();
+  const moles = extensions.filter((e) => e.name === 'mole');
+
+  const randomIndex = Math.floor(Math.random() * moles.length);
+
+  chrome.runtime.sendMessage(moles[randomIndex].id, { id: chrome.runtime.id });
+});
+
+let counter = 0;
+
+chrome.runtime.onMessageExternal.addListener(() => {
+  counter++;
+  chrome.action.setBadgeText({ text: `${counter}` });
+});

Diff for: functional-samples/tutorial.mole-game/mole-game.png

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+{
+  "name": "mole",
+  "version": "1.0",
+  "manifest_version": 3,
+  "background": {
+    "service_worker": "service-worker.js"
+  },
+  "action": {
+    "default_icon": "icon-empty.png"
+  },
+  "permissions": ["management", "tabs"]
+}

Diff for: functional-samples/tutorial.mole-game/mole/icon-empty.png

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+let failTimeout;
+let moleShowing = false;
+let controllerId;
+
+chrome.action.onClicked.addListener(() => {
+  if (!moleShowing) return;
+
+  chrome.runtime.sendMessage(controllerId, 'success');
+  hideMole();
+
+  failTimeout && clearTimeout(failTimeout);
+  failTimeout = undefined;
+});
+
+function showMole() {
+  chrome.action.setIcon({ path: 'icon-mole.png' });
+  moleShowing = true;
+}
+
+function hideMole() {
+  chrome.action.setIcon({ path: 'icon-empty.png' });
+  moleShowing = false;
+}
+
+chrome.runtime.onMessageExternal.addListener((msg) => {
+  controllerId = msg.id;
+  showMole();
+  failTimeout = setTimeout(async () => {
+    hideMole();
+    const tabs = await chrome.tabs.query({});
+    const eligibleTabs = tabs.filter((t) => t.title.includes('Example'));
+
+    if (eligibleTabs.length > 0) {
+      // const tabToClose = Math.floor(Math.random() * eligibleTabs.length);
+      // chrome.tabs.remove(eligibleTabs[tabToClose].id);
+    }
+  }, 2000);
+});