Remove unnecessary Future types in Perfetto code.

packages/devtools_app/lib/src/screens/performance/panes/timeline_events/perfetto/_perfetto_controller_web.dart

@@ -2,7 +2,6 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-import 'dart:async';
 import 'dart:html' as html;
 import 'dart:ui' as ui;
 
@@ -116,20 +115,20 @@ class PerfettoControllerImpl extends PerfettoController {
   }
 
   @override
-  Future<void> onBecomingActive() async {
+  void onBecomingActive() {
     assert(timelineEventsController.isActiveFeature);
     if (pendingTraceEventsToLoad != null) {
-      await loadTrace(pendingTraceEventsToLoad!);
+      loadTrace(pendingTraceEventsToLoad!);
       pendingTraceEventsToLoad = null;
     }
     if (pendingScrollToTimeRange != null) {
-      await scrollToTimeRange(pendingScrollToTimeRange!);
+      scrollToTimeRange(pendingScrollToTimeRange!);
       pendingScrollToTimeRange = null;
     }
   }
 
   @override
-  Future<void> loadTrace(List<TraceEventWrapper> devToolsTraceEvents) async {
+  void loadTrace(List<TraceEventWrapper> devToolsTraceEvents) {
     if (!timelineEventsController.isActiveFeature) {
       pendingTraceEventsToLoad = List.from(devToolsTraceEvents);
       return;
@@ -139,7 +138,7 @@ class PerfettoControllerImpl extends PerfettoController {
   }
 
   @override
-  Future<void> scrollToTimeRange(TimeRange timeRange) async {
+  void scrollToTimeRange(TimeRange timeRange) {
     if (!timelineEventsController.isActiveFeature) {
       pendingScrollToTimeRange = timeRange;
       return;
@@ -149,7 +148,7 @@ class PerfettoControllerImpl extends PerfettoController {
   }
 
   @override
-  Future<void> clear() async {
-    await loadTrace([]);
+  void clear() {
+    loadTrace([]);
   }
 }

packages/devtools_app/lib/src/screens/performance/panes/timeline_events/perfetto/perfetto_controller.dart

@@ -35,11 +35,11 @@ abstract class PerfettoController extends DisposableController {
 
   void init() {}
 
-  Future<void> onBecomingActive() async {}
+  void onBecomingActive() async {}
 
-  Future<void> loadTrace(List<TraceEventWrapper> devToolsTraceEvents) async {}
+  void loadTrace(List<TraceEventWrapper> devToolsTraceEvents) async {}
 
-  Future<void> scrollToTimeRange(TimeRange timeRange) async {}
+  void scrollToTimeRange(TimeRange timeRange) async {}
 
-  Future<void> clear() async {}
+  void clear() async {}
 }

packages/devtools_app/lib/src/screens/performance/panes/timeline_events/timeline_events_controller.dart

@@ -137,7 +137,7 @@ class TimelineEventsController extends PerformanceFeatureController
   @override
   Future<void> onBecomingActive() async {
     if (_perfettoMode) {
-      await perfettoController.onBecomingActive();
+      perfettoController.onBecomingActive();
     }
     await super.onBecomingActive();
   }
@@ -279,7 +279,7 @@ class TimelineEventsController extends PerformanceFeatureController
   Future<void> _processAllTraceEvents() async {
     if (_perfettoMode) {
       await perfettoController.processor.processData(allTraceEvents);
-      await perfettoController.loadTrace(allTraceEvents);
+      perfettoController.loadTrace(allTraceEvents);
     } else {
       await legacyController.processTraceEvents(
         allTraceEvents,
@@ -349,7 +349,7 @@ class TimelineEventsController extends PerformanceFeatureController
       }
     }
 
-    await perfettoController.scrollToTimeRange(frame.timeFromFrameTiming);
+    perfettoController.scrollToTimeRange(frame.timeFromFrameTiming);
   }
 
   Future<void> _legacySelectFrame(FlutterFrame frame) async {
@@ -532,13 +532,13 @@ class TimelineEventsController extends PerformanceFeatureController
     await legacyController.setOfflineData(offlineData);
 
     if (offlineData.selectedFrame != null && _perfettoMode) {
-      await perfettoController
+      perfettoController
           .scrollToTimeRange(offlineData.selectedFrame!.timeFromFrameTiming);
     }
   }
 
   @override
-  Future<void> clearData() async {
+  void clearData() {
     allTraceEvents.clear();
     _unassignedFlutterFrameEvents.clear();
 
@@ -547,7 +547,7 @@ class TimelineEventsController extends PerformanceFeatureController
     legacyController.clearData();
     _status.value = EventsControllerStatus.empty;
     if (FeatureFlags.embeddedPerfetto) {
-      await perfettoController.clear();
+      perfettoController.clear();
     }
   }
 

packages/devtools_app/test/performance/timeline_events/legacy/legacy_event_processor_test.dart

@@ -54,7 +54,7 @@ void main() {
       when(mockPerformanceController.data).thenReturn(data);
       when(mockPerformanceController.clearData()).thenAnswer((_) async {
         data.clear();
-        await timelineEventsController.clearData();
+        timelineEventsController.clearData();
       });
       processor = timelineEventsController.legacyController.processor
         ..primeThreadIds(

packages/devtools_app/test/performance/timeline_events/timeline_events_controller_test.dart

@@ -88,7 +88,7 @@ void main() {
         // Verify an empty list is returned for bad input.
         expect(eventsController.legacyController.matchesForSearch(''), isEmpty);
 
-        await eventsController.clearData();
+        eventsController.clearData();
         expect(eventsController.data!.timelineEvents, isEmpty);
         expect(
           eventsController.legacyController.matchesForSearch('test'),
@@ -111,7 +111,7 @@ void main() {
       });
 
       test('search query searches through previous matches', () async {
-        await eventsController.clearData();
+        eventsController.clearData();
         eventsController.addTimelineEvent(goldenUiTimelineEvent..deepCopy());
 
         final data = eventsController.data!;