Performance: Trace the default categories when Show All Events

experiment is enabled.

Currently, this experiment reveals a few more events that
were not allowlisted. But this change will expand the tracing category
selection to all non-high-overhead categories.

Driveby: fix undefined property exception.

Change-Id: I236aad44e40724d82d8c37055686e03148059d2b
Bug: 1321307
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/3616460
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
Commit-Queue: Paul Irish <paulirish@chromium.org>

front_end/models/timeline_model/TimelineModel.ts

@@ -1211,7 +1211,7 @@ export class TimelineModelImpl {
 
   private processBrowserEvent(event: SDK.TracingModel.Event): void {
     if (event.name === RecordType.LatencyInfoFlow) {
-      if (event.args.chrome_latency_info.trace_id) {
+      if (event.args.chrome_latency_info?.trace_id) {
         this.knownInputEvents.add(event.args.chrome_latency_info.trace_id);
       }
       return;

front_end/panels/timeline/TimelineController.ts

@@ -90,7 +90,7 @@ export class TimelineController implements SDK.TargetManager.SDKModelObserver<SD
     // 'disabled-by-default-v8.cpu_profiler'
     //   └ default: on, option: enableJSSampling
     const categoriesArray = [
-      '-*',
+      Root.Runtime.experiments.isEnabled('timelineShowAllEvents') ? '*' : '-*',
       TimelineModel.TimelineModel.TimelineModelImpl.Category.Console,
       TimelineModel.TimelineModel.TimelineModelImpl.Category.UserTiming,
       'devtools.timeline',

test/unittests/front_end/helpers/EnvironmentHelpers.ts

@@ -48,6 +48,7 @@ const REGISTERED_EXPERIMENTS = [
   'protocolMonitor',
   'sourcesPrettyPrint',
   'wasmDWARFDebugging',
+  'timelineShowAllEvents',
   'timelineV8RuntimeCallStats',
   'timelineInvalidationTracking',
   'ignoreListJSFramesOnTimeline',