Initial frame based timeline flame chart. (#1336)

* Initial frame based timeline flame chart.

Author: kenzieschmoll

packages/devtools_app/lib/src/charts/flutter/flame_chart.dart

@@ -0,0 +1,91 @@
+// Copyright 2019 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/material.dart';
+
+import '../../flutter/common_widgets.dart';
+import '../../ui/colors.dart';
+import '../../ui/fake_flutter/_real_flutter.dart';
+
+const double rowPadding = 2.0;
+const double rowHeight = 25.0;
+const double rowHeightWithPadding = rowHeight + rowPadding;
+const double sectionSpacing = 15.0;
+const double topOffset = rowHeightWithPadding;
+const double sideInset = 70.0;
+
+class FlameChartRow {
+  const FlameChartRow({
+    @required this.nodes,
+    @required this.index,
+  });
+
+  final List<FlameChartNode> nodes;
+  final int index;
+}
+
+class FlameChartNode<T> extends StatelessWidget {
+  const FlameChartNode({
+    Key key,
+    @required this.text,
+    @required this.tooltip,
+    @required this.rect,
+    @required this.backgroundColor,
+    @required this.textColor,
+    @required this.data,
+    @required this.selected,
+    @required this.onSelected,
+  }) : super(key: key);
+
+  FlameChartNode.sectionLabel({
+    Key key,
+    @required this.text,
+    @required this.textColor,
+    @required this.backgroundColor,
+    @required double top,
+    @required double width,
+  })  : rect = Rect.fromLTRB(rowPadding, top, width, top + rowHeight),
+        tooltip = '',
+        data = null,
+        selected = false,
+        onSelected = ((_) {});
+
+  static const _selectedNodeColor = mainUiColorSelectedLight;
+
+  final Rect rect;
+  final String text;
+  final String tooltip;
+  final Color backgroundColor;
+  final Color textColor;
+  final T data;
+  final bool selected;
+  final void Function(T) onSelected;
+
+  @override
+  Widget build(BuildContext context) {
+    return Positioned.fromRect(
+      rect: rect,
+      child: Tooltip(
+        message: tooltip,
+        waitDuration: tooltipWait,
+        preferBelow: false,
+        child: InkWell(
+          onTap: () => onSelected(data),
+          child: Container(
+            padding: const EdgeInsets.only(left: 6.0),
+            alignment: Alignment.centerLeft,
+            color: selected ? _selectedNodeColor : backgroundColor,
+            child: Text(
+              text,
+              textAlign: TextAlign.left,
+              overflow: TextOverflow.ellipsis,
+              style: TextStyle(
+                color: selected ? Colors.black : textColor,
+              ),
+            ),
+          ),
+        ),
+      ),
+    );
+  }
+}

packages/devtools_app/lib/src/flutter/common_widgets.dart

@@ -7,6 +7,8 @@ import 'package:flutter_widgets/flutter_widgets.dart';
 
 import '../framework/framework_core.dart';
 
+const tooltipWait = Duration(milliseconds: 500);
+
 /// Convenience [Divider] with [Padding] that provides a good divider in forms.
 class PaddedDivider extends StatelessWidget {
   const PaddedDivider({