[RPP] Disable v8-source-rundown-sources event unless exp is on

Partial revert of https://crrev.com/c/6293325

Bug: 409707727, 409086863
Change-Id: I1b9f58ef3ee364af2c919df3162f2be1f7dcb143
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/6448573
Auto-Submit: Connor Clark <cjamcl@chromium.org>
Reviewed-by: Paul Irish <paulirish@chromium.org>
Commit-Queue: Connor Clark <cjamcl@chromium.org>

Author: Connor Clark

front_end/panels/timeline/TimelineController.ts

@@ -97,7 +97,6 @@ export class TimelineController implements Trace.TracingManager.TracingManagerCl
       disabledByDefault('devtools.timeline.frame'),
       disabledByDefault('devtools.timeline.stack'),
       disabledByDefault('devtools.timeline'),
-      disabledByDefault('devtools.v8-source-rundown-sources'),
       disabledByDefault('devtools.v8-source-rundown'),
       disabledByDefault('v8.compile'),
       disabledByDefault('v8.inspector'),
@@ -109,6 +108,10 @@ export class TimelineController implements Trace.TracingManager.TracingManagerCl
       'navigation,rail',
     ];
 
+    if (Root.Runtime.experiments.isEnabled(Root.Runtime.ExperimentName.TIMELINE_COMPILED_SOURCES)) {
+      categoriesArray.push(disabledByDefault('devtools.v8-source-rundown-sources'));
+    }
+
     if (Root.Runtime.experiments.isEnabled('timeline-v8-runtime-call-stats') && options.enableJSSampling) {
       categoriesArray.push(disabledByDefault('v8.runtime_stats_sampling'));
     }