Rename StatisticsOverlay to PerformanceOverlay.

examples/stocks/lib/main.dart

@@ -42,7 +42,7 @@ class StocksAppState extends State<StocksApp> {
     backupMode: BackupMode.enabled,
     debugShowGrid: false,
     debugShowSizes: false,
-    showRenderingStatistics: false
+    showPerformanceOverlay: false
   );
 
   void initState() {
@@ -108,7 +108,7 @@ class StocksAppState extends State<StocksApp> {
       title: 'Stocks',
       theme: theme,
       debugShowMaterialGrid: _configuration.debugShowGrid,
-      showRenderingPerformanceOverlay: _configuration.showRenderingStatistics,
+      showPerformanceOverlay: _configuration.showPerformanceOverlay,
       routes: <String, RouteBuilder>{
          '/':         (RouteArguments args) => new StockHome(_stocks, _symbols, _configuration, configurationUpdater),
          '/settings': (RouteArguments args) => new StockSettings(_configuration, configurationUpdater)

examples/stocks/lib/stock_settings.dart

@@ -31,8 +31,8 @@ class StockSettingsState extends State<StockSettings> {
     sendUpdates(config.configuration.copyWith(debugShowSizes: value));
   }
 
-  void _handleShowRenderingStatisticsChanged(bool value) {
-    sendUpdates(config.configuration.copyWith(showRenderingStatistics: value));
+  void _handleShowPerformanceOverlayChanged(bool value) {
+    sendUpdates(config.configuration.copyWith(showPerformanceOverlay: value));
   }
 
   void _confirmOptimismChange() {
@@ -103,12 +103,12 @@ class StockSettingsState extends State<StockSettings> {
       ),
       new DrawerItem(
         icon: 'action/picture_in_picture',
-        onPressed: () { _handleShowRenderingStatisticsChanged(!config.configuration.showRenderingStatistics); },
+        onPressed: () { _handleShowPerformanceOverlayChanged(!config.configuration.showPerformanceOverlay); },
         child: new Row(<Widget>[
           new Flexible(child: new Text('Show rendering performance overlay')),
           new Switch(
-            value: config.configuration.showRenderingStatistics,
-            onChanged: _handleShowRenderingStatisticsChanged
+            value: config.configuration.showPerformanceOverlay,
+            onChanged: _handleShowPerformanceOverlayChanged
           ),
         ])
       ),

examples/stocks/lib/stock_types.dart

@@ -13,34 +13,34 @@ class StockConfiguration {
     this.backupMode,
     this.debugShowGrid,
     this.debugShowSizes,
-    this.showRenderingStatistics
+    this.showPerformanceOverlay
   }) {
     assert(stockMode != null);
     assert(backupMode != null);
     assert(debugShowGrid != null);
     assert(debugShowSizes != null);
-    assert(showRenderingStatistics != null);
+    assert(showPerformanceOverlay != null);
   }
 
   final StockMode stockMode;
   final BackupMode backupMode;
   final bool debugShowGrid;
   final bool debugShowSizes;
-  final bool showRenderingStatistics;
+  final bool showPerformanceOverlay;
 
   StockConfiguration copyWith({
     StockMode stockMode,
     BackupMode backupMode,
     bool debugShowGrid,
     bool debugShowSizes,
-    bool showRenderingStatistics
+    bool showPerformanceOverlay
   }) {
     return new StockConfiguration(
       stockMode: stockMode ?? this.stockMode,
       backupMode: backupMode ?? this.backupMode,
       debugShowGrid: debugShowGrid ?? this.debugShowGrid,
       debugShowSizes: debugShowSizes ?? this.debugShowSizes,
-      showRenderingStatistics: showRenderingStatistics ?? this.showRenderingStatistics
+      showPerformanceOverlay: showPerformanceOverlay ?? this.showPerformanceOverlay
     );
   }
 }
\ No newline at end of file

packages/flutter/lib/rendering.dart

@@ -23,10 +23,10 @@ export 'src/rendering/node.dart';
 export 'src/rendering/object.dart';
 export 'src/rendering/overflow.dart';
 export 'src/rendering/paragraph.dart';
+export 'src/rendering/performance_overlay.dart';
 export 'src/rendering/proxy_box.dart';
 export 'src/rendering/shifted_box.dart';
 export 'src/rendering/stack.dart';
-export 'src/rendering/statistics_box.dart';
 export 'src/rendering/view.dart';
 export 'src/rendering/viewport.dart';
 

packages/flutter/lib/src/material/material_app.dart

@@ -49,12 +49,12 @@ class MaterialApp extends StatefulComponent {
     this.onGenerateRoute,
     this.onLocaleChanged,
     this.debugShowMaterialGrid: false,
-    this.showRenderingPerformanceOverlay: false
+    this.showPerformanceOverlay: false
   }) : super(key: key) {
     assert(routes != null);
     assert(routes.containsKey(Navigator.defaultRouteName) || onGenerateRoute != null);
     assert(debugShowMaterialGrid != null);
-    assert(showRenderingPerformanceOverlay != null);
+    assert(showPerformanceOverlay != null);
   }
 
   final String title;
@@ -63,7 +63,7 @@ class MaterialApp extends StatefulComponent {
   final RouteFactory onGenerateRoute;
   final LocaleChangedCallback onLocaleChanged;
   final bool debugShowMaterialGrid;
-  final bool showRenderingPerformanceOverlay;
+  final bool showPerformanceOverlay;
 
   _MaterialAppState createState() => new _MaterialAppState();
 }
@@ -174,10 +174,10 @@ class _MaterialAppState extends State<MaterialApp> implements BindingObserver {
       }
       return true;
     });
-    if (config.showRenderingPerformanceOverlay) {
+    if (config.showPerformanceOverlay) {
       result = new Stack([
         result,
-        new Positioned(bottom: 0.0, left: 0.0, right: 0.0, child: new StatisticsOverlay.allEnabled()),
+        new Positioned(bottom: 0.0, left: 0.0, right: 0.0, child: new PerformanceOverlay.allEnabled()),
       ]);
     }
     return result;

packages/flutter/lib/src/rendering/layer.dart

@@ -128,9 +128,9 @@ class PictureLayer extends Layer {
 }
 
 /// A layer that indicates to the compositor that it should display
-/// certain statistics within it
-class StatisticsLayer extends Layer {
-  StatisticsLayer({
+/// certain performance statistics within it.
+class PerformanceOverlayLayer extends Layer {
+  PerformanceOverlayLayer({
     Offset offset: Offset.zero,
     this.paintBounds,
     this.optionsMask,
@@ -147,7 +147,7 @@ class StatisticsLayer extends Layer {
 
   void addToScene(ui.SceneBuilder builder, Offset layerOffset) {
     assert(optionsMask != null);
-    builder.addStatistics(optionsMask, paintBounds.shift(offset + layerOffset));
+    builder.addPerformanceOverlay(optionsMask, paintBounds.shift(offset + layerOffset));
     builder.setRasterizerTracingThreshold(rasterizerThreshold);
   }
 }

packages/flutter/lib/src/rendering/object.dart

@@ -183,18 +183,18 @@ class PaintingContext {
 
   static final Paint _disableAntialias = new Paint()..isAntiAlias = false;
 
-  /// Push a statistics overlay.
+  /// Push a performance overlay.
   ///
-  /// Statistics overlays are always composited because they're drawn by the
+  /// Performance overlays are always composited because they're drawn by the
   /// compositor.
-  void pushStatistics(Offset offset, int optionsMask, int rasterizerThreshold, Size size) {
+  void pushPerformanceOverlay(Offset offset, int optionsMask, int rasterizerThreshold, Size size) {
     _stopRecordingIfNeeded();
-    StatisticsLayer statisticsLayer = new StatisticsLayer(
+    PerformanceOverlayLayer performanceOverlayLayer = new PerformanceOverlayLayer(
       paintBounds: new Rect.fromLTWH(0.0, 0.0, size.width, size.height),
       optionsMask: optionsMask,
       rasterizerThreshold: rasterizerThreshold
     );
-    _appendLayer(statisticsLayer, offset);
+    _appendLayer(performanceOverlayLayer, offset);
   }
 
   /// Push a rectangular clip rect.

packages/flutter/lib/src/rendering/statistics_box.dart → packages/flutter/lib/src/rendering/performance_overlay.dart

@@ -5,9 +5,12 @@
 import 'box.dart';
 import 'object.dart';
 
-/// The options that control whether the statistics overlay displays certain
-/// aspects of the compositor
-enum StatisticsOption {
+/// The options that control whether the performance overlay displays certain
+/// aspects of the compositor.
+enum PerformanceOverlayOption {
+  // these must be in the order needed for their index values to match the
+  // constants in //engine/src/sky/compositor/performance_overlay_layer.h
+
   /// Display the frame time and FPS of the last frame rendered. This field is
   /// updated every frame.
   ///
@@ -16,11 +19,13 @@ enum StatisticsOption {
   /// and tries to flush them onto the screen. When the total time taken by this
   /// step exceeds the frame slice, a frame is lost.
   displayRasterizerStatistics,
+
   /// Display the rasterizer frame times as they change over a set period of
   /// time in the form of a graph. The y axis of the graph denotes the total
   /// time spent by the rasterizer as a fraction of the total frame slice. When
   /// the bar turns red, a frame is lost.
   visualizeRasterizerStatistics,
+
   /// Display the frame time and FPS at which the interface can construct a
   /// layer tree for the rasterizer (whose behavior is described above) to
   /// consume.
@@ -28,6 +33,7 @@ enum StatisticsOption {
   /// This involves all layout, animations, etc. When the total time taken by
   /// this step exceeds the frame slice, a frame is lost.
   displayEngineStatistics,
+
   /// Display the engine frame times as they change over a set period of time
   /// in the form of a graph. The y axis of the graph denotes the total time
   /// spent by the eninge as a fraction of the total frame slice. When the bar
@@ -35,13 +41,13 @@ enum StatisticsOption {
   visualizeEngineStatistics,
 }
 
-class RenderStatisticsBox extends RenderBox {
-  RenderStatisticsBox({ int optionsMask: 0, int rasterizerThreshold: 0 })
+class RenderPerformanceOverlay extends RenderBox {
+  RenderPerformanceOverlay({ int optionsMask: 0, int rasterizerThreshold: 0 })
     : _optionsMask = optionsMask,
       _rasterizerThreshold = rasterizerThreshold;
 
   /// The mask is created by shifting 1 by the index of the specific
-  /// StatisticOption to enable.
+  /// PerformanceOverlayOption to enable.
   int get optionsMask => _optionsMask;
   int _optionsMask;
   void set optionsMask(int mask) {
@@ -71,13 +77,13 @@ class RenderStatisticsBox extends RenderBox {
   }
 
   double get intrinsicHeight {
-    const double kGraphHeight = 80.0; // must match value in statistics_layer.cc
+    const double kGraphHeight = 80.0; // must match value in performance_overlay_layer.cc
     double result = 0.0;
-    if ((optionsMask | (1 << StatisticsOption.displayRasterizerStatistics.index) > 0) ||
-        (optionsMask | (1 << StatisticsOption.visualizeRasterizerStatistics.index) > 0))
+    if ((optionsMask | (1 << PerformanceOverlayOption.displayRasterizerStatistics.index) > 0) ||
+        (optionsMask | (1 << PerformanceOverlayOption.visualizeRasterizerStatistics.index) > 0))
       result += kGraphHeight;
-    if ((optionsMask | (1 << StatisticsOption.displayEngineStatistics.index) > 0) ||
-        (optionsMask | (1 << StatisticsOption.visualizeEngineStatistics.index) > 0))
+    if ((optionsMask | (1 << PerformanceOverlayOption.displayEngineStatistics.index) > 0) ||
+        (optionsMask | (1 << PerformanceOverlayOption.visualizeEngineStatistics.index) > 0))
       result += kGraphHeight;
     return result;
   }
@@ -95,6 +101,6 @@ class RenderStatisticsBox extends RenderBox {
   }
 
   void paint(PaintingContext context, Offset offset) {
-    context.pushStatistics(offset, optionsMask, rasterizerThreshold, size);
+    context.pushPerformanceOverlay(offset, optionsMask, rasterizerThreshold, size);
   }
 }

packages/flutter/lib/src/widgets/statistics_overlay.dart → packages/flutter/lib/src/widgets/performance_overlay.dart

@@ -7,22 +7,22 @@ import 'package:flutter/rendering.dart';
 import 'framework.dart';
 
 /// Displays performance statistics.
-class StatisticsOverlay extends LeafRenderObjectWidget {
+class PerformanceOverlay extends LeafRenderObjectWidget {
   // TODO(abarth): We should have a page on the web site with a screenshot and
   // an explanation of all the various readouts.
 
-  /// Create a statistics overlay that only displays specific statistics. The
+  /// Create a performance overlay that only displays specific statistics. The
   /// mask is created by shifting 1 by the index of the specific
   /// [StatisticOption] to enable.
-  StatisticsOverlay({ this.optionsMask, this.rasterizerThreshold: 0, Key key }) : super(key: key);
+  PerformanceOverlay({ this.optionsMask, this.rasterizerThreshold: 0, Key key }) : super(key: key);
 
-  /// Create a statistics overaly that displays all available statistics
-  StatisticsOverlay.allEnabled({ Key key, this.rasterizerThreshold: 0 })
+  /// Create a performance overlay that displays all available statistics
+  PerformanceOverlay.allEnabled({ Key key, this.rasterizerThreshold: 0 })
     : optionsMask = (
-        1 << StatisticsOption.displayRasterizerStatistics.index |
-        1 << StatisticsOption.visualizeRasterizerStatistics.index |
-        1 << StatisticsOption.displayEngineStatistics.index |
-        1 << StatisticsOption.visualizeEngineStatistics.index
+        1 << PerformanceOverlayOption.displayRasterizerStatistics.index |
+        1 << PerformanceOverlayOption.visualizeRasterizerStatistics.index |
+        1 << PerformanceOverlayOption.displayEngineStatistics.index |
+        1 << PerformanceOverlayOption.visualizeEngineStatistics.index
       ),
       super(key: key);
 
@@ -51,17 +51,17 @@ class StatisticsOverlay extends LeafRenderObjectWidget {
   /// the instrumentation available in observatory.
   ///
   /// To decide what threshold interval to use, count the number of horizontal
-  /// lines displayed in the statistics overlay for the rasterizer (not the
+  /// lines displayed in the performance overlay for the rasterizer (not the
   /// engine). That should give an idea of how often frames are skipped (and by
   /// how many frame intervals).
   final int rasterizerThreshold;
 
-  RenderStatisticsBox createRenderObject() => new RenderStatisticsBox(
+  RenderPerformanceOverlay createRenderObject() => new RenderPerformanceOverlay(
     optionsMask: optionsMask,
     rasterizerThreshold: rasterizerThreshold
   );
 
-  void updateRenderObject(RenderStatisticsBox renderObject, RenderObjectWidget oldWidget) {
+  void updateRenderObject(RenderPerformanceOverlay renderObject, RenderObjectWidget oldWidget) {
     renderObject.optionsMask = optionsMask;
     renderObject.rasterizerThreshold = rasterizerThreshold;
   }

packages/flutter/lib/widgets.dart

@@ -27,14 +27,14 @@ export 'src/widgets/navigator.dart';
 export 'src/widgets/notification_listener.dart';
 export 'src/widgets/overlay.dart';
 export 'src/widgets/page_storage.dart';
-export 'src/widgets/pages.dart';
 export 'src/widgets/pageable_list.dart';
+export 'src/widgets/pages.dart';
+export 'src/widgets/performance_overlay.dart';
 export 'src/widgets/placeholder.dart';
 export 'src/widgets/routes.dart';
 export 'src/widgets/scrollable.dart';
 export 'src/widgets/scrollable_grid.dart';
 export 'src/widgets/scrollable_list.dart';
-export 'src/widgets/statistics_overlay.dart';
 export 'src/widgets/status_transitions.dart';
 export 'src/widgets/title.dart';
 export 'src/widgets/transitions.dart';