Add analytics tracking for compile and refresh times for Flutter Web (#41545)

packages/flutter_tools/lib/src/build_runner/resident_web_runner.dart

@@ -264,9 +264,17 @@ class ResidentWebRunner extends ResidentRunner {
       return OperationResult(1, 'Failed to recompile application.');
     }
     if (supportsServiceProtocol) {
+      // Send an event for only recompilation.
+      final Duration recompileDuration = timer.elapsed;
+      flutterUsage.sendTiming('hot', 'web-recompile', recompileDuration);
       try {
         final vmservice.Response reloadResponse = await _vmService.callServiceExtension('hotRestart');
         printStatus('Restarted application in ${getElapsedAsMilliseconds(timer.elapsed)}.');
+
+        // Send timing analytics for full restart and for refresh.
+        flutterUsage.sendTiming('hot', 'web-restart', timer.elapsed);
+        flutterUsage.sendTiming('hot', 'web-refresh', timer.elapsed - recompileDuration);
+
         return reloadResponse.type == 'Success'
             ? OperationResult.ok
             : OperationResult(1, reloadResponse.toString());

packages/flutter_tools/test/general.shard/resident_web_runner_test.dart

@@ -173,7 +173,7 @@ void main() {
       connectionInfoCompleter: connectionInfoCompleter,
     ));
     await connectionInfoCompleter.future;
-    when(mockWebFs.recompile()).thenAnswer((Invocation _) async {
+    when(mockWebFs.recompile()).thenAnswer((Invocation invocation) async {
       return true;
     });
     when(mockVmService.callServiceExtension('hotRestart')).thenAnswer((Invocation _) async {
@@ -189,6 +189,9 @@ void main() {
       'cd29': 'false',
       'cd30': 'true',
     })).called(1);
+    verify(Usage.instance.sendTiming('hot', 'web-restart', any)).called(1);
+    verify(Usage.instance.sendTiming('hot', 'web-refresh', any)).called(1);
+    verify(Usage.instance.sendTiming('hot', 'web-recompile', any)).called(1);
   }, overrides: <Type, Generator>{
     Usage: () => MockFlutterUsage(),
   }));
@@ -200,7 +203,7 @@ void main() {
       connectionInfoCompleter: connectionInfoCompleter,
     ));
     await connectionInfoCompleter.future;
-    when(mockWebFs.recompile()).thenAnswer((Invocation _) async {
+    when(mockWebFs.recompile()).thenAnswer((Invocation invocation) async {
       return true;
     });
     when(mockVmService.callServiceExtension('hotRestart')).thenAnswer((Invocation _) async {
@@ -216,6 +219,9 @@ void main() {
       'cd29': 'false',
       'cd30': 'true',
     })).called(1);
+    verify(Usage.instance.sendTiming('hot', 'web-restart', any)).called(1);
+    verify(Usage.instance.sendTiming('hot', 'web-refresh', any)).called(1);
+    verify(Usage.instance.sendTiming('hot', 'web-recompile', any)).called(1);
   }, overrides: <Type, Generator>{
     Usage: () => MockFlutterUsage(),
   }));