[Mojo] ApplicationRunnerChromium should dump stacks in debug

mojo/application/application_runner_chromium.cc

 // Copyright 2014 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 "mojo/application/application_runner_chromium.h"
 
 #include "base/at_exit.h"
 #include "base/command_line.h"
+#include "base/debug/stack_trace.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "mojo/common/message_pump_mojo.h"
 #include "mojo/public/cpp/application/application_delegate.h"
 #include "mojo/public/cpp/application/application_impl.h"
 
 namespace mojo {
 
 // static
 void ApplicationImpl::Terminate() {
@@ skipping 19 matching lines @@
 
 MojoResult ApplicationRunnerChromium::Run(MojoHandle shell_handle) {
   DCHECK(!has_run_);
   has_run_ = true;
 
   base::CommandLine::Init(0, NULL);
 #if !defined(COMPONENT_BUILD)
   base::AtExitManager at_exit;
 #endif
 
+#ifndef NDEBUG
+  base::debug::EnableInProcessStackDumping();
+#endif
+
   {
     scoped_ptr<base::MessageLoop> loop;
     if (message_loop_type_ == base::MessageLoop::TYPE_CUSTOM)
       loop.reset(new base::MessageLoop(common::MessagePumpMojo::Create()));
     else
       loop.reset(new base::MessageLoop(message_loop_type_));
 
     ApplicationImpl impl(delegate_.get(),
                          MakeScopedHandle(MessagePipeHandle(shell_handle)));
     loop->Run();
   }
   delegate_.reset();
   return MOJO_RESULT_OK;
 }
 
 }  // namespace mojo