1 files changed, 7 insertions, 0 deletions
diff --git a/chromium/third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h b/chromium/third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h
index d189d432d3d..1fbb622b565 100644
--- a/chromium/third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h
+++ b/chromium/third_party/blink/renderer/platform/instrumentation/tracing/trace_event.h
@@ -29,6 +29,8 @@ namespace blink {
 namespace TraceEvent {
 
 using base::trace_event::TraceScopedTrackableObject;
+using AsyncEnabledStateObserver =
+    base::trace_event::TraceLog::AsyncEnabledStateObserver;
 
 inline base::TimeTicks ToTraceTimestamp(double seconds) {
   return base::TimeTicks() + base::TimeDelta::FromSecondsD(seconds);
@@ -40,6 +42,11 @@ void ToTraceTimestamp(int64_t);
 PLATFORM_EXPORT void EnableTracing(const String& category_filter);
 PLATFORM_EXPORT void DisableTracing();
 
+PLATFORM_EXPORT void AddAsyncEnabledStateObserver(
+    base::WeakPtr<AsyncEnabledStateObserver>);
+PLATFORM_EXPORT void RemoveAsyncEnabledStateObserver(
+    AsyncEnabledStateObserver*);
+
 }  // namespace TraceEvent
 }  // namespace blink