[Mojo] ApplicationRunnerChromium should dump stacks in debug

mojo/application/application_runner_chromium.cc

Index: mojo/application/application_runner_chromium.cc
diff --git a/mojo/application/application_runner_chromium.cc b/mojo/application/application_runner_chromium.cc
index fa139c72d25e051e544a4454668dd6784a292c31..e49b8e206e003590c3b2616b711544e76104788b 100644
--- a/mojo/application/application_runner_chromium.cc
+++ b/mojo/application/application_runner_chromium.cc
@@ -6,6 +6,7 @@
 
 #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"
@@ -45,6 +46,10 @@ MojoResult ApplicationRunnerChromium::Run(MojoHandle shell_handle) {
   base::AtExitManager at_exit;
 #endif
 
+#ifndef NDEBUG
+  base::debug::EnableInProcessStackDumping();
+#endif
+
   {
     scoped_ptr<base::MessageLoop> loop;
     if (message_loop_type_ == base::MessageLoop::TYPE_CUSTOM)