Implement sampling profiler (chromium side change)

chrome/browser/lifetime/application_lifetime.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 "chrome/browser/lifetime/application_lifetime.h"
 
 #include "ash/shell.h"
 #include "base/bind.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 170 matching lines @@
 #endif
 }
 
 void StartShutdownTracing() {
   const CommandLine& command_line = *CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kTraceShutdown)) {
     base::debug::CategoryFilter category_filter(
         command_line.GetSwitchValueASCII(switches::kTraceShutdown));
     base::debug::TraceLog::GetInstance()->SetEnabled(
         category_filter,
+        base::debug::TraceLog::RECORDING_MODE,
         base::debug::TraceLog::RECORD_UNTIL_FULL);
   }
   TRACE_EVENT0("shutdown", "StartShutdownTracing");
 }
 
 // The Android implementation is in application_lifetime_android.cc
 #if !defined(OS_ANDROID)
 void AttemptRestart() {
   // TODO(beng): Can this use ProfileManager::GetLoadedProfiles instead?
   for (chrome::BrowserIterator it; !it.done(); it.Next())
@@ skipping 194 matching lines @@
   //    environment is still active.
   if (browser->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_NATIVE)
     return !ash::Shell::HasInstance();
   else if (browser->host_desktop_type() == chrome::HOST_DESKTOP_TYPE_ASH)
     return BrowserList::GetInstance(chrome::HOST_DESKTOP_TYPE_NATIVE)->empty();
 #endif
   return true;
 }
 
 }  // namespace chrome