Gallery demo start-time performance test (#3655)

*  Gallery demo start-time performance test

examples/material_gallery/lib/demo/fitness_demo.dart

@@ -4,7 +4,6 @@
 
 import 'dart:async';
 import 'dart:math' as math;
-import 'dart:ui' as ui;
 import 'package:flutter/material.dart';
 import 'package:flutter/services.dart';
 import 'package:flutter_sprites/flutter_sprites.dart';
@@ -288,7 +287,7 @@ class _ProgressCircle extends NodeWithSize {
     Paint circlePaint = new Paint()
       ..color = Colors.white30
       ..strokeWidth = 24.0
-      ..style = ui.PaintingStyle.stroke;
+      ..style = PaintingStyle.stroke;
 
     canvas.drawCircle(
       new Point(size.width / 2.0, size.height / 2.0),
@@ -299,7 +298,7 @@ class _ProgressCircle extends NodeWithSize {
     Paint pathPaint = new Paint()
       ..color = Colors.purple[500]
       ..strokeWidth = 25.0
-      ..style = ui.PaintingStyle.stroke;
+      ..style = PaintingStyle.stroke;
 
     double angle = value.clamp(0.0, 1.0) * _kSweep;
     Path path = new Path()

examples/material_gallery/lib/gallery/app.dart

@@ -44,6 +44,16 @@ final Map<String, WidgetBuilder> kRoutes = <String, WidgetBuilder>{
   TypographyDemo.routeName: (BuildContext context) => new TypographyDemo(),
 };
 
+final ThemeData _kGalleryLightTheme = new ThemeData(
+  brightness: ThemeBrightness.light,
+  primarySwatch: Colors.purple
+);
+
+final ThemeData _kGalleryDarkTheme = new ThemeData(
+  brightness: ThemeBrightness.dark,
+  primarySwatch: Colors.purple
+);
+
 class GalleryApp extends StatefulWidget {
   GalleryApp({ Key key }) : super(key: key);
 
@@ -73,13 +83,3 @@ class GalleryAppState extends State<GalleryApp> {
     );
   }
 }
-
-ThemeData _kGalleryLightTheme = new ThemeData(
-  brightness: ThemeBrightness.light,
-  primarySwatch: Colors.purple
-);
-
-ThemeData _kGalleryDarkTheme = new ThemeData(
-  brightness: ThemeBrightness.dark,
-  primarySwatch: Colors.purple
-);

examples/material_gallery/lib/gallery/item.dart

@@ -2,6 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+import 'dart:developer';
+
 import 'package:flutter/material.dart';
 
 typedef Widget GalleryDemoBuilder();
@@ -21,8 +23,13 @@ class GalleryItem extends StatelessWidget {
       leading: leading,
       title: new Text(title),
       onTap: () {
-        if (routeName != null)
+        if (routeName != null) {
+          Timeline.instantSync('Start Transition', arguments: <String, String>{
+            'from': '/',
+            'to': routeName
+          });
           Navigator.pushNamed(context, routeName);
+        }
       }
     );
   }

examples/material_gallery/test_driver/transitions_perf.dart

@@ -0,0 +1,11 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter_driver/driver_extension.dart';
+import 'package:material_gallery/main.dart' as app;
+
+void main() {
+  enableFlutterDriverExtension();
+  app.main();
+}

examples/material_gallery/test_driver/transitions_perf_test.dart

@@ -0,0 +1,93 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:async';
+
+import 'package:flutter_driver/flutter_driver.dart';
+import 'package:test/test.dart';
+
+// Warning: the following strings must be kept in sync with GalleryHome.
+const List<String> demoCategories = const <String>['Demos', 'Components', 'Style'];
+
+const List<String> demoNames = const <String>[
+  'Weather',
+  'Fitness',
+  'Fancy lines',
+  'Flexible space toolbar',
+  'Floating action button',
+  'Buttons',
+  'Cards',
+  'Chips',
+  'Date picker',
+  'Data tables',
+  'Dialog',
+  'Drop-down button',
+  'Expand/collapse list control',
+  'Grid',
+  'Icons',
+  'Leave-behind list items',
+  'List',
+  'Menus',
+  'Modal bottom sheet',
+  'Over-scroll',
+  'Page selector',
+  'Persistent bottom sheet',
+  'Progress indicators',
+  'Scrollable tabs',
+  'Selection controls',
+  'Sliders',
+  'Snackbar',
+  'Tabs',
+  'Text fields',
+  'Time picker',
+  'Tooltips',
+  'Colors',
+  'Typography'
+];
+
+void main() {
+  group('flutter gallery transitions', () {
+    FlutterDriver driver;
+    setUpAll(() async {
+      driver = await FlutterDriver.connect();
+    });
+
+    tearDownAll(() async {
+      if (driver != null)
+        driver.close();
+    });
+
+    test('all demos', () async {
+      Timeline timeline = await driver.traceAction(() async {
+        // Expand the demo category submenus.
+        for (String category in demoCategories.reversed) {
+          await driver.tap(find.text(category));
+          await new Future<Null>.delayed(new Duration(milliseconds: 500));
+        }
+        // Scroll each demo menu item into view, launch the demo and
+        // return to the demo menu 2x.
+        for(String demoName in demoNames) {
+          SerializableFinder menuItem = find.text(demoName);
+          await driver.scrollIntoView(menuItem);
+          await new Future<Null>.delayed(new Duration(milliseconds: 500));
+
+          for(int i = 0; i < 2; i += 1) {
+            await driver.tap(menuItem); // Launch the demo
+            await new Future<Null>.delayed(new Duration(milliseconds: 500));
+            await driver.tap(find.byTooltip('Back'));
+            await new Future<Null>.delayed(new Duration(milliseconds: 1000));
+          }
+        }
+      },
+      categories: const <TracingCategory>[
+        TracingCategory.dart,
+        TracingCategory.gc,
+        TracingCategory.compiler
+      ]);
+      new TimelineSummary.summarize(timeline)
+        ..writeSummaryToFile('transitions_perf', pretty: true)
+        ..writeTimelineToFile('transitions_perf', pretty: true);
+    }, timeout: new Timeout(new Duration(minutes: 15)));
+  });
+}

packages/flutter_driver/lib/flutter_driver.dart

@@ -15,7 +15,8 @@ export 'src/driver.dart' show
   find,
   CommonFinders,
   EvaluatorFunction,
-  FlutterDriver;
+  FlutterDriver,
+  TracingCategory;
 
 export 'src/error.dart' show
   DriverError,

packages/flutter_driver/lib/src/driver.dart

@@ -15,13 +15,39 @@ import 'health.dart';
 import 'message.dart';
 import 'timeline.dart';
 
+enum TracingCategory {
+  all, api, compiler, dart, debugger, embedder, gc, isolate, vm
+}
+
+const List<TracingCategory> _defaultCategories = const <TracingCategory>[TracingCategory.all];
+
+// See https://github.com/dart-lang/sdk/blob/master/runtime/vm/timeline.cc#L32
+String _tracingCategoriesToString(List<TracingCategory> categories) {
+  final String contents = categories.map((TracingCategory category) {
+    switch(category) {
+      case TracingCategory.all: return 'all';
+      case TracingCategory.api: return 'API';
+      case TracingCategory.compiler: return 'Compiler';
+      case TracingCategory.dart: return 'Dart';
+      case TracingCategory.debugger: return 'Debugger';
+      case TracingCategory.embedder: return 'Embedder';
+      case TracingCategory.gc: return 'GC';
+      case TracingCategory.isolate: return 'Isolate';
+      case TracingCategory.vm: return 'VM';
+      default:
+        throw 'Unknown tracing category $category';
+    }
+  }).join(', ');
+  return '[$contents]';
+}
+
 final Logger _log = new Logger('FlutterDriver');
 
 /// A convenient accessor to frequently used finders.
 ///
 /// Examples:
 ///
-///     driver.tap(find.byText('Save'));
+///     driver.tap(find.text('Save'));
 ///     driver.scroll(find.byValueKey(42));
 const CommonFinders find = const CommonFinders._();
 
@@ -211,15 +237,24 @@ class FlutterDriver {
     return await _sendCommand(new Scroll(finder, dx, dy, duration, frequency)).then((Map<String, dynamic> _) => null);
   }
 
+  /// Scrolls the Scrollable ancestor of the widget located by [finder]
+  /// until the widget is completely visible.
+  Future<Null> scrollIntoView(SerializableFinder finder) async {
+    return await _sendCommand(new ScrollIntoView(finder)).then((Map<String, dynamic> _) => null);
+  }
+
   /// Returns the text in the `Text` widget located by [finder].
   Future<String> getText(SerializableFinder finder) async {
     return GetTextResult.fromJson(await _sendCommand(new GetText(finder))).text;
   }
 
   /// Starts recording performance traces.
-  Future<Null> startTracing() async {
+  Future<Null> startTracing({List<TracingCategory> categories: _defaultCategories}) async {
+    assert(categories != null && categories.length > 0);
     try {
-      await _peer.sendRequest(_kSetVMTimelineFlagsMethod, {'recordedStreams': '[all]'});
+      await _peer.sendRequest(_kSetVMTimelineFlagsMethod, {
+        'recordedStreams': _tracingCategoriesToString(categories)
+      });
       return null;
     } catch(error, stackTrace) {
       throw new DriverError(
@@ -251,8 +286,8 @@ class FlutterDriver {
   ///
   /// This is merely a convenience wrapper on top of [startTracing] and
   /// [stopTracingAndDownloadTimeline].
-  Future<Timeline> traceAction(Future<dynamic> action()) async {
+  Future<Timeline> traceAction(Future<dynamic> action(), { List<TracingCategory> categories: _defaultCategories }) async {
-    await startTracing();
+    await startTracing(categories: categories);
     await action();
     return stopTracingAndDownloadTimeline();
   }

packages/flutter_driver/lib/src/extension.dart

@@ -63,6 +63,7 @@ class FlutterDriverExtension {
       'tap': tap,
       'get_text': getText,
       'scroll': scroll,
+      'scrollIntoView': scrollIntoView,
       'waitFor': waitFor,
     });
 
@@ -71,6 +72,7 @@ class FlutterDriverExtension {
       'tap': Tap.deserialize,
       'get_text': GetText.deserialize,
       'scroll': Scroll.deserialize,
+      'scrollIntoView': ScrollIntoView.deserialize,
       'waitFor': WaitFor.deserialize,
     });
 
@@ -207,6 +209,12 @@ class FlutterDriverExtension {
     return new ScrollResult();
   }
 
+  Future<ScrollResult> scrollIntoView(ScrollIntoView command) async {
+    Finder target = await _waitForElement(_createFinder(command.finder));
+    await Scrollable.ensureVisible(target.evaluate().single);
+    return new ScrollResult();
+  }
+
   Future<GetTextResult> getText(GetText command) async {
     Finder target = await _waitForElement(_createFinder(command.finder));
     // TODO(yjbanov): support more ways to read text

packages/flutter_driver/lib/src/gesture.dart

@@ -73,6 +73,19 @@ class Scroll extends CommandWithTarget {
   });
 }
 
+/// Command the driver to ensure that the element represented by [finder]
+/// has been scrolled completely into view.
+class ScrollIntoView extends CommandWithTarget {
+  @override
+  final String kind = 'scrollIntoView';
+
+  ScrollIntoView(SerializableFinder finder) : super(finder);
+
+  static ScrollIntoView deserialize(Map<String, dynamic> json) {
+    return new ScrollIntoView(SerializableFinder.deserialize(json));
+  }
+}
+
 class ScrollResult extends Result {
   static ScrollResult fromJson(Map<String, dynamic> json) {
     return new ScrollResult();

packages/flutter_driver/test/flutter_driver_test.dart

@@ -235,6 +235,50 @@ void main() {
         expect(timeline.events.single.name, 'test event');
       });
     });
+
+    group('traceAction categories', () {
+      test('specify non-default categories', () async {
+        bool actionCalled = false;
+        bool startTracingCalled = false;
+        bool stopTracingCalled = false;
+
+        when(mockPeer.sendRequest('_setVMTimelineFlags', argThat(equals({'recordedStreams': '[Dart, GC, Compiler]'}))))
+          .thenAnswer((_) async {
+            startTracingCalled = true;
+            return null;
+          });
+
+        when(mockPeer.sendRequest('_setVMTimelineFlags', argThat(equals({'recordedStreams': '[]'}))))
+          .thenAnswer((_) async {
+            stopTracingCalled = true;
+            return null;
+          });
+
+        when(mockPeer.sendRequest('_getVMTimeline')).thenAnswer((_) async {
+          return <String, dynamic> {
+            'traceEvents': [
+              {
+                'name': 'test event'
+              }
+            ],
+          };
+        });
+
+        Timeline timeline = await driver.traceAction(() {
+          actionCalled = true;
+        },
+        categories: const <TracingCategory>[
+          TracingCategory.dart,
+          TracingCategory.gc,
+          TracingCategory.compiler
+        ]);
+
+        expect(actionCalled, isTrue);
+        expect(startTracingCalled, isTrue);
+        expect(stopTracingCalled, isTrue);
+        expect(timeline.events.single.name, 'test event');
+      });
+    });
   });
 }