scheduler: Emit a normal instant trace event when blocking tasks

components/scheduler/renderer/renderer_scheduler_impl.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
@@ skipping 1151 matching lines @@
   for (auto& web_view_scheduler : MainThreadOnly().web_view_schedulers_)
     web_view_scheduler->AddConsoleWarning(message);
 }
 
 void RendererSchedulerImpl::OnTriedToExecuteBlockedTask(
     const TaskQueue& queue,
     const base::PendingTask& task) {
   if (!MainThreadOnly().have_reported_blocking_intervention_in_current_policy) {
     MainThreadOnly().have_reported_blocking_intervention_in_current_policy =
         true;
-    TRACE_TASK_EXECUTION("RendererSchedulerImpl::TaskBlocked", task);
+    TRACE_EVENT_INSTANT0("renderer.scheduler",
+                         "RendererSchedulerImpl::TaskBlocked",
+                         TRACE_EVENT_SCOPE_THREAD);
   }
 
   if (!MainThreadOnly().have_reported_blocking_intervention_since_navigation) {
     {
       base::AutoLock lock(any_thread_lock_);
       if (!AnyThread().have_seen_touchstart)
         return;
     }
     MainThreadOnly().have_reported_blocking_intervention_since_navigation =
         true;
     BroadcastConsoleWarning(
         "Deferred long-running timer task(s) to improve scrolling smoothness. "
         "See crbug.com/574343.");
   }
 }
 
 }  // namespace scheduler