Add more screenshots. (#8653)

Author: isoos

pkg/pub_integration/test/browser_test.dart

@@ -105,6 +105,10 @@ void main() {
           await page.takeScreenshots(
               prefix: 'package-page/versions-page', selector: 'body');
 
+          await page.gotoOrigin('/packages/retry/changelog');
+          await page.takeScreenshots(
+              prefix: 'package-page/changelog-page', selector: 'body');
+
           await page.gotoOrigin('/packages/retry/score');
           await page.takeScreenshots(
               prefix: 'package-page/score-page', selector: 'body');

pkg/pub_integration/test/dartdoc_search_test.dart

@@ -6,6 +6,7 @@ import 'dart:convert';
 
 import 'package:http/http.dart' as http;
 import 'package:pub_integration/src/fake_test_context_provider.dart';
+import 'package:pub_integration/src/screenshot_utils.dart';
 import 'package:pub_integration/src/test_browser.dart';
 import 'package:puppeteer/puppeteer.dart';
 import 'package:test/test.dart';
@@ -60,6 +61,11 @@ void main() {
             startsWith('$origin/documentation/oxygen/latest/oxygen/'));
         expect(page.url, endsWith('.html'));
         expect(await page.content, contains('TypeEnum'));
+
+        await page.takeScreenshots(
+          prefix: 'dartdoc-page/enum-page',
+          selector: 'body',
+        );
       });
 
       // test library page redirect

pkg/pub_integration/test/pkg_admin_page_test.dart

@@ -71,6 +71,13 @@ void main() {
               '#-pkg-admin-automated-github-repository', 'value');
           expect(value, githubRepository);
         });
+
+        // visit activity log page
+        await user.withBrowserPage((page) async {
+          await page.gotoOrigin('/packages/test_pkg/activity-log');
+          await page.takeScreenshots(
+              prefix: 'package-page/activity-log-page', selector: 'body');
+        });
       });
     },
     timeout: Timeout.factor(testTimeoutFactor),