Split the TRACE_EVENTs from the LOG/HistogramTimers/TimerEvents functionality.

src/optimizing-compile-dispatcher.cc

 // Copyright 2012 the V8 project 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 "src/optimizing-compile-dispatcher.h"
 
 #include "src/base/atomicops.h"
 #include "src/full-codegen/full-codegen.h"
 #include "src/isolate.h"
+#include "src/tracing/trace-event.h"
 #include "src/v8.h"
 
 namespace v8 {
 namespace internal {
 
 namespace {
 
 void DisposeOptimizedCompileJob(OptimizedCompileJob* job,
                                 bool restore_function_code) {
   // The recompile job is allocated in the CompilationInfo's zone.
@@ skipping 32 matching lines @@
   // v8::Task overrides.
   void Run() override {
     DisallowHeapAllocation no_allocation;
     DisallowHandleAllocation no_handles;
     DisallowHandleDereference no_deref;
 
     OptimizingCompileDispatcher* dispatcher =
         isolate_->optimizing_compile_dispatcher();
     {
       TimerEventScope<TimerEventRecompileConcurrent> timer(isolate_);
+      TRACE_EVENT0("v8", "V8.RecompileConcurrent");
 
       if (dispatcher->recompilation_delay_ != 0) {
         base::OS::Sleep(base::TimeDelta::FromMilliseconds(
             dispatcher->recompilation_delay_));
       }
 
       dispatcher->CompileNext(dispatcher->NextInput(true));
     }
     {
       base::LockGuard<base::Mutex> lock_guard(&dispatcher->ref_count_mutex_);
@@ skipping 277 matching lines @@
       info->closure()->PrintName();
       PrintF(", AST id %d]\n", info->osr_ast_id().ToInt());
     }
     DisposeOptimizedCompileJob(stale, false);
   }
   osr_buffer_[osr_buffer_cursor_] = job;
   osr_buffer_cursor_ = (osr_buffer_cursor_ + 1) % osr_buffer_capacity_;
 }
 }  // namespace internal
 }  // namespace v8