Update from https://crrev.com/306655

net/tools/dump_cache/simple_cache_dumper.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 "net/tools/dump_cache/simple_cache_dumper.h"
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "base/message_loop/message_loop_proxy.h"
+#include "base/profiler/scoped_tracker.h"
 #include "base/threading/thread.h"
 #include "net/base/cache_type.h"
 #include "net/base/io_buffer.h"
 #include "net/base/net_errors.h"
 #include "net/disk_cache/disk_cache.h"
 #include "net/tools/dump_cache/cache_dumper.h"
 
 namespace net {
 
 SimpleCacheDumper::SimpleCacheDumper(base::FilePath input_path,
@@ skipping 230 matching lines @@
   src_entry_->Close();
   writer_->CloseEntry(dst_entry_, base::Time::Now(), base::Time::Now());
   src_entry_ = NULL;
   dst_entry_ = NULL;
 
   state_ = STATE_OPEN_ENTRY;
   return OK;
 }
 
 void SimpleCacheDumper::OnIOComplete(int rv) {
+  // TODO(vadimt): Remove ScopedTracker below once crbug.com/422516 is fixed.
+  tracked_objects::ScopedTracker tracking_profile(
+      FROM_HERE_WITH_EXPLICIT_FUNCTION(
+          "422516 SimpleCacheDumper::OnIOComplete"));
+
   rv = DoLoop(rv);
 
   if (rv != ERR_IO_PENDING) {
     rv_ = rv;
     cache_.reset();
     base::MessageLoop::current()->Quit();
   }
 }
 
 }  // namespace net