Add language detection sample

functional-samples/ai.gemini-on-device-language-detection/background.js

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+chrome.runtime.onInstalled.addListener(function () {
+  chrome.contextMenus.create({
+    id: 'context-menu-example',
+    title: 'Detect language',
+    contexts: ['selection']
+  });
+});
+
+chrome.contextMenus.onClicked.addListener(async (info, tab) => {
+  if (info.menuItemId === 'context-menu-example') {
+    // Get the selected text
+    const selectedText = info.selectionText;
+    console.log('Detecting language for', selectedText);
+
+    if (!('translation' in self) || !('canDetect' in self.translation)) {
+      console.log('translation API not available');
+      return;
+    }
+    const canDetect = await self.translation.canDetect();
+    let detector;
+    if (canDetect === 'no') {
+      console.log('The language detector is not usable.');
+      return;
+    }
+    if (canDetect === 'readily') {
+      console.log('The language detector is ready.');
+      detector = await self.translation.createDetector();
+    } else {
+      console.log('Downloading language detector.');
+      // The language detector can be used after model download.
+      detector = await self.translation.createDetector();
+      detector.addEventListener('downloadprogress', (e) => {
+        console.log(e.loaded, e.total);
+      });
+      await detector.ready;
+    }
+    console.log('Detecting language for: ', selectedText);
+    const results = await detector.detect(selectedText);
+    for (const result of results) {
+      // Show the full list of potential languages with their likelihood, ranked
+      // from most likely to least likely. In practice, one would pick the top
+      // language(s) that cross a high enough threshold.
+      console.log(result.detectedLanguage, result.confidence);
+    }
+  }
+});

functional-samples/ai.gemini-on-device-language-detection/manifest.json

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+{
+  "manifest_version": 3,
+  "key": "MIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAwXcgHmijBw+bghyCZXyerwlfzojzNcPpIUeQtI8OBhxLSyxNZgq4wl8v58uGTMMTzvqfNiLj3CT7j+JwG5MJTOCMXf1gSIGZaR53NmE53F5nR7VO/Vb/PhZkBhJbU7x5uQsfVyXyUeZH6BUaAaFRnc4kO5knrL3dfm3WQ9DTMRMIkJ62vx2ebGFV6Uiss3p99wwBbTvJahKpB0dPQZauF/rtBaqyeklaPqpTxVXdmrV3YgNEwA+n3CGnwRDVmhLyzDguOWo6ZI1xhEPxTlIq2GgpmUtbe59R43R/8Sg+nlPH+y6Wy9DvgJy3lUUOUVQDvu6NEqzUjKXtIpHyUcs+YwIDAQAB",
+  "trial_tokens": [
+    "Asfzkynpxnpf5C8XTPv7mqCfsqgOraqVl6UK9VTWWEgMCCc/EpM0sbU+9ae0KxOBHMRg0oN+7v8nf5Z8yTl9ng0AAAB1eyJvcmlnaW4iOiJjaHJvbWUtZXh0ZW5zaW9uOi8va2NrbW1lcGdhaW1raGlranBlYWhlaG9obG1rZmNkYmQiLCJmZWF0dXJlIjoiTGFuZ3VhZ2VEZXRlY3Rpb25BUEkiLCJleHBpcnkiOjE3NDk1OTk5OTl9"
+  ],
+  "name": "Built-in AI Text Detection Sample",
+  "version": "1.0",
+  "permissions": ["contextMenus"],
+  "background": {
+    "service_worker": "background.js"
+  }
+}