Google search example (puppeteer#220)

Add google search example.

References puppeteer#178

examples/search.js

@@ -0,0 +1,40 @@
+/**
+ * Copyright 2017 Google Inc. All rights reserved.
+ *
+ * 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
+ *
+ *     http://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.
+ */
+
+(async() => {
+
+const {Browser} = require('puppeteer');
+const browser = new Browser();
+
+const page = await browser.newPage();
+await page.goto('https://google.com', {waitUntil: 'networkidle'});
+// Type our query into the search bar
+await page.type('puppeteer');
+
+await page.click('input[type="submit"]');
+
+// Wait for the results to show up
+await page.waitForSelector('h3 a');
+
+// Extract the results from the page
+const links = await page.evaluate(() => {
+  const anchors = Array.from(document.querySelectorAll('h3 a'));
+  return anchors.map(anchor => anchor.textContent);
+});
+console.log(links.join('\n'));
+browser.close();
+
+})();