Pending tasks in a message loop should be deleted before shutting down Blink

content/renderer/renderer_main.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/base_switches.h"
 #include "base/command_line.h"
 #include "base/debug/debugger.h"
 #include "base/debug/stack_trace.h"
 #include "base/debug/trace_event.h"
 #include "base/i18n/rtl.h"
@@ skipping 131 matching lines @@
 
   base::StatsCounterTimer stats_counter_timer("Content.RendererInit");
   base::StatsScope<base::StatsCounterTimer> startup_timer(stats_counter_timer);
 
   RendererMessageLoopObserver task_observer;
 #if defined(OS_MACOSX)
   // As long as scrollbars on Mac are painted with Cocoa, the message pump
   // needs to be backed by a Foundation-level loop to process NSTimers. See
   // http://crbug.com/306348#c24 for details.
   scoped_ptr<base::MessagePump> pump(new base::MessagePumpNSRunLoop());
-  base::MessageLoop main_message_loop(pump.Pass());
+  scoped_ptr<base::MessageLoop> main_message_loop(
+      new base::MessageLoop(pump.Pass()));
 #else
   // The main message loop of the renderer services doesn't have IO or UI tasks.
-  base::MessageLoop main_message_loop;
+  scoped_ptr<base::MessageLoop> main_message_loop(new base::MessageLoop());
 #endif
-  main_message_loop.AddTaskObserver(&task_observer);
+  main_message_loop->AddTaskObserver(&task_observer);
 
   base::PlatformThread::SetName("CrRendererMain");
 
   bool no_sandbox = parsed_command_line.HasSwitch(switches::kNoSandbox);
 
   // Initialize histogram statistics gathering system.
   base::StatisticsRecorder::Initialize();
 
   // Initialize statistical testing infrastructure.  We set the entropy provider
   // to NULL to disallow the renderer process from creating its own one-time
@@ skipping 23 matching lines @@
   // zygote_main_linux.cc.  However, calling multiple times from the same thread
   // is OK.
   InitializeWebRtcModule();
 #endif
 
   {
 #if defined(OS_WIN) || defined(OS_MACOSX)
     // TODO(markus): Check if it is OK to unconditionally move this
     // instruction down.
     RenderProcessImpl render_process;
-    new RenderThreadImpl();
+    new RenderThreadImpl(main_message_loop.Pass());
 #endif
     bool run_loop = true;
     if (!no_sandbox) {
       run_loop = platform.EnableSandbox();
     } else {
       LOG(ERROR) << "Running without renderer sandbox";
 #ifndef NDEBUG
       // For convenience, we print the stack traces for crashes.  When sandbox
       // is enabled, the in-process stack dumping is enabled as part of the
       // EnableSandbox() call.
       base::debug::EnableInProcessStackDumping();
 #endif
     }
 #if defined(OS_POSIX) && !defined(OS_MACOSX)
     RenderProcessImpl render_process;
-    new RenderThreadImpl();
+    new RenderThreadImpl(main_message_loop.Pass());
 #endif
 
     base::HighResolutionTimerManager hi_res_timer_manager;
 
     startup_timer.Stop();  // End of Startup Time Measurement.
 
     if (run_loop) {
 #if defined(OS_MACOSX)
       if (pool)
         pool->Recycle();
 #endif
       TRACE_EVENT_BEGIN_ETW("RendererMain.START_MSG_LOOP", 0, 0);
       base::MessageLoop::current()->Run();
       TRACE_EVENT_END_ETW("RendererMain.START_MSG_LOOP", 0, 0);
     }
   }
   platform.PlatformUninitialize();
   TRACE_EVENT_END_ETW("RendererMain", 0, "");
   return 0;
 }
 
 }  // namespace content