Set process phases in the StackSamplingProfiler.

content/browser/browser_main_runner.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 "content/public/browser/browser_main_runner.h"
 
 #include "base/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/debug/leak_annotations.h"
@@ skipping 127 matching lines @@
   int Run() override {
     DCHECK(initialization_started_);
     DCHECK(!is_shutdown_);
     main_loop_->RunMainMessageLoopParts();
     return main_loop_->GetResultCode();
   }
 
   void Shutdown() override {
     DCHECK(initialization_started_);
     DCHECK(!is_shutdown_);
+
 #ifdef LEAK_SANITIZER
     // Invoke leak detection now, to avoid dealing with shutdown-only leaks.
     // Normally this will have already happened in
     // BroserProcessImpl::ReleaseModule(), so this call has no effect. This is
     // only for processes which do not instantiate a BrowserProcess.
     // If leaks are found, the process will exit here.
     __lsan_do_leak_check();
 #endif
+
+    main_loop_->PreShutdown();
+
     // If startup tracing has not been finished yet, replace it's dumper
     // with special version, which would save trace file on exit (i.e.
     // startup tracing becomes a version of shutdown tracing).
     // There are two cases:
     // 1. Startup duration is not reached.
     // 2. Or startup duration is not specified for --trace-config-file flag.
     std::unique_ptr<BrowserShutdownProfileDumper> startup_profiler;
     if (main_loop_->is_tracing_startup_for_duration()) {
       main_loop_->StopStartupTracingTimer();
       if (main_loop_->startup_trace_file() !=
@@ skipping 70 matching lines @@
 BrowserMainRunner* BrowserMainRunner::Create() {
   return new BrowserMainRunnerImpl();
 }
 
 // static
 bool BrowserMainRunner::ExitedMainMessageLoop() {
   return g_exited_main_message_loop;
 }
 
 }  // namespace content