Privacy mv3 sample (GoogleChrome#956)

* Implemented mv3 privacy API sample

* Added mv3 privacy API sample

* Expanded sample and updated readme

* Update service-worker.js

api-samples/privacy/README.md

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+# chrome.privacy
+
+This sample demonstrates using `chrome.privacy.services` to get and set privacy settings.
+
+## Overview
+
+The service worker sets the default value for Autofill using `chrome.privacy.services.autofillEnabled.set()` when the extension is installed. Whenever a page is loaded, or when the action button is clicked, the extension will display the current Autofill setting of `autofillAddressEnabled` by updating the extension badge.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Pin the extension to the taskbar and either click the action button or load a webpage.

api-samples/privacy/manifest.json

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+{
+  "name": "Privacy API sample",
+  "version": "1.0",
+  "manifest_version": 3,
+  "background": {
+    "service_worker": "service-worker.js"
+  },
+  "permissions": ["privacy"],
+  "action": {}
+}

api-samples/privacy/service-worker.js

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+// Copyright 2023 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+chrome.runtime.onInstalled.addListener(() => {
+  // Set default value for Autofill Enabled
+  chrome.privacy.services.autofillEnabled.set({ value: true });
+});
+
+chrome.runtime.onStartup.addListener(() => {
+  updateAutofillEnabledStatus();
+});
+
+chrome.tabs.onUpdated.addListener((tabId, changeInfo, tab) => {
+  if (changeInfo.status === 'complete' && tab.active) {
+    updateAutofillEnabledStatus();
+  }
+});
+
+function updateAutofillEnabledStatus() {
+  chrome.privacy.services.autofillEnabled.get({}, (details) => {
+    const autofillEnabled = details.value;
+    const badgeText = autofillEnabled ? 'Enabled' : 'Disabled';
+    const badgeColor = autofillEnabled ? '#00FF00' : '#FF0000';
+
+    chrome.action.setBadgeText({ text: badgeText });
+    chrome.action.setBadgeBackgroundColor({ color: badgeColor });
+  });
+}
+
+chrome.action.onClicked.addListener(() => {
+  updateAutofillEnabledStatus();
+});