Report overall and transfer timings as part of hot reload statistics, analytics. (#26537)

packages/flutter_tools/lib/src/run_hot.dart

@@ -675,7 +675,7 @@ class HotRunner extends ResidentRunner {
           analyticsParameters[kEventReloadSyncedProceduresCount] = "${details['receivedProceduresCount']}";
           analyticsParameters[kEventReloadSyncedBytes] = '${updatedDevFS.syncedBytes}';
           analyticsParameters[kEventReloadInvalidatedSourcesCount] = '${updatedDevFS.invalidatedSourcesCount}';
-          flutterUsage.sendEvent('hot', 'reload', parameters: analyticsParameters);
+          analyticsParameters[kEventReloadTransferTimeInMs] = '${devFSTimer.elapsed.inMilliseconds}';
           final int loadedLibraryCount = reloadReport['details']['loadedLibraryCount'];
           final int finalLibraryCount = reloadReport['details']['finalLibraryCount'];
           printTrace('reloaded $loadedLibraryCount of $finalLibraryCount libraries');
@@ -770,17 +770,22 @@ class HotRunner extends ResidentRunner {
         reassembleTimer.elapsed.inMilliseconds);
 
     reloadTimer.stop();
-    printTrace('Hot reload performed in ${getElapsedAsMilliseconds(reloadTimer.elapsed)}.');
+    final Duration reloadDuration = reloadTimer.elapsed;
+    final int reloadInMs = reloadDuration.inMilliseconds;
+
+    analyticsParameters[kEventReloadOverallTimeInMs] = '$reloadInMs';
+    flutterUsage.sendEvent('hot', 'reload', parameters: analyticsParameters);
+
+    printTrace('Hot reload performed in $reloadInMs.');
     // Record complete time it took for the reload.
-    _addBenchmarkData('hotReloadMillisecondsToFrame',
-        reloadTimer.elapsed.inMilliseconds);
+    _addBenchmarkData('hotReloadMillisecondsToFrame', reloadInMs);
     // Only report timings if we reloaded a single view without any
     // errors or timeouts.
     if ((reassembleViews.length == 1) &&
         !reassembleAndScheduleErrors &&
         !reassembleTimedOut &&
         shouldReportReloadTime)
-      flutterUsage.sendTiming('hot', 'reload', reloadTimer.elapsed);
+      flutterUsage.sendTiming('hot', 'reload', reloadDuration);
 
     return OperationResult(
       reassembleAndScheduleErrors ? 1 : OperationResult.ok.code,

packages/flutter_tools/lib/src/usage.dart

@@ -23,6 +23,8 @@ const String kEventReloadSyncedClassesCount = 'cd8';
 const String kEventReloadSyncedProceduresCount = 'cd9';
 const String kEventReloadSyncedBytes = 'cd10';
 const String kEventReloadInvalidatedSourcesCount = 'cd11';
+const String kEventReloadTransferTimeInMs = 'cd12';
+const String kEventReloadOverallTimeInMs = 'cd13';
 
 Usage get flutterUsage => Usage.instance;