Update from https://crrev.com/320343

base/threading/thread.cc

 // Copyright (c) 2012 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 "base/threading/thread.h"
 
 #include "base/bind.h"
 #include "base/lazy_instance.h"
+#include "base/profiler/scoped_tracker.h"
+#include "base/synchronization/waitable_event.h"
 #include "base/third_party/dynamic_annotations/dynamic_annotations.h"
 #include "base/threading/thread_id_name_manager.h"
 #include "base/threading/thread_local.h"
 #include "base/threading/thread_restrictions.h"
-#include "base/synchronization/waitable_event.h"
 
 #if defined(OS_WIN)
 #include "base/win/scoped_com_initializer.h"
 #endif
 
 namespace base {
 
 namespace {
 
 // We use this thread-local variable to record whether or not a thread exited
@@ skipping 63 matching lines @@
 bool Thread::Start() {
   Options options;
 #if defined(OS_WIN)
   if (com_status_ == STA)
     options.message_loop_type = MessageLoop::TYPE_UI;
 #endif
   return StartWithOptions(options);
 }
 
 bool Thread::StartWithOptions(const Options& options) {
+  // TODO(eroman): Remove once crbug.com/465458 is solved.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+        "465458 base::Thread::StartWithOptions"));
+
   DCHECK(!message_loop_);
 #if defined(OS_WIN)
   DCHECK((com_status_ != STA) ||
       (options.message_loop_type == MessageLoop::TYPE_UI));
 #endif
 
   SetThreadWasQuitProperly(false);
 
   StartupData startup_data(options);
   startup_data_ = &startup_data;
 
   if (!PlatformThread::Create(options.stack_size, this, &thread_)) {
     DLOG(ERROR) << "failed to create thread";
     startup_data_ = NULL;
     return false;
   }
 
+  // TODO(eroman): Remove once crbug.com/465458 is solved.
+  tracked_objects::ScopedTracker tracking_profile_wait(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "465458 base::Thread::StartWithOptions (Wait)"));
+
   // Wait for the thread to start and initialize message_loop_
   base::ThreadRestrictions::ScopedAllowWait allow_wait;
   startup_data.event.Wait();
 
   // set it to NULL so we don't keep a pointer to some object on the stack.
   startup_data_ = NULL;
   started_ = true;
 
   DCHECK(message_loop_);
   return true;
@@ skipping 113 matching lines @@
 
     // Assert that MessageLoop::Quit was called by ThreadQuitHelper.
     DCHECK(GetThreadWasQuitProperly());
 
     // We can't receive messages anymore.
     message_loop_ = NULL;
   }
 }
 
 }  // namespace base