Add skia perf links to Cocoon home page and sidebar (#687)

diff --git a/app_flutter/lib/index_page.dart b/app_flutter/lib/index_page.dart
index 630d20d..7253577 100644
--- a/app_flutter/lib/index_page.dart
+++ b/app_flutter/lib/index_page.dart
@@ -117,6 +117,17 @@
               SizedBox(
                 width: 300,
                 child: RaisedButton(
+                  child: const Text('Benchmarks on Skia Perf'),
+                  onPressed: () => launch('https://flutter-perf.skia.org/'),
+                  padding: const EdgeInsets.all(20),
+                  color: Colors.blueAccent,
+                  textColor: Colors.white,
+                ),
+              ),
+              Container(height: 25),
+              SizedBox(
+                width: 300,
+                child: RaisedButton(
                   child: const Text('Repository'),
                   onPressed: () => launch('/repository.html'),
                   padding: const EdgeInsets.all(20),
diff --git a/app_flutter/lib/navigation_drawer.dart b/app_flutter/lib/navigation_drawer.dart
index 3ecae38..b6a1672 100644
--- a/app_flutter/lib/navigation_drawer.dart
+++ b/app_flutter/lib/navigation_drawer.dart
@@ -40,6 +40,12 @@
             selected: currentRoute == '/build',
           ),
           ListTile(
+            key: const Key('nav-link-skia-perf'),
+            title: const Text('Benchmarks on Skia Perf'),
+            leading: Icon(Icons.show_chart),
+            onTap: () => launch('https://flutter-perf.skia.org/'),
+          ),
+          ListTile(
             key: const Key('nav-link-benchmarks'),
             title: const Text('Benchmarks'),
             leading: Icon(Icons.show_chart),
diff --git a/app_flutter/test/index_page_test.dart b/app_flutter/test/index_page_test.dart
index 9a80a56..3ad6919 100644
--- a/app_flutter/test/index_page_test.dart
+++ b/app_flutter/test/index_page_test.dart
@@ -27,6 +27,7 @@
 
     expect(find.text('Build'), findsOneWidget);
     expect(find.text('Performance'), findsOneWidget);
+    expect(find.text('Benchmarks on Skia Perf'), findsOneWidget);
     expect(find.text('Repository'), findsOneWidget);
     expect(find.text('Infra Agents'), findsOneWidget);
   });
diff --git a/app_flutter/test/navigation_drawer_test.dart b/app_flutter/test/navigation_drawer_test.dart
index 56da0dd..62c0389 100644
--- a/app_flutter/test/navigation_drawer_test.dart
+++ b/app_flutter/test/navigation_drawer_test.dart
@@ -112,6 +112,40 @@
       );
     });
 
+    testWidgets('skia perf opens skia perf url', (WidgetTester tester) async {
+      const MethodChannel urlLauncherChannel =
+          MethodChannel('plugins.flutter.io/url_launcher');
+      final List<MethodCall> log = <MethodCall>[];
+      urlLauncherChannel.setMockMethodCallHandler(
+          (MethodCall methodCall) async => log.add(methodCall));
+
+      await tester.pumpWidget(
+        const MaterialApp(
+          home: NavigationDrawer(),
+        ),
+      );
+
+      const String skiaPerfText = 'Benchmarks on Skia Perf';
+      expect(find.text(skiaPerfText), findsOneWidget);
+      await tester.tap(find.text(skiaPerfText));
+      await tester.pump();
+
+      expect(
+        log,
+        <Matcher>[
+          isMethodCall('launch', arguments: <String, Object>{
+            'url': 'https://flutter-perf.skia.org/',
+            'useSafariVC': true,
+            'useWebView': false,
+            'enableJavaScript': false,
+            'enableDomStorage': false,
+            'universalLinksOnly': false,
+            'headers': <String, String>{}
+          })
+        ],
+      );
+    });
+
     testWidgets('repository opens repository html url',
         (WidgetTester tester) async {
       const MethodChannel urlLauncherChannel =