Adding shutdown tracing capabilities

chrome/browser/profiles/profile_destroyer.cc

Index: chrome/browser/profiles/profile_destroyer.cc
diff --git a/chrome/browser/profiles/profile_destroyer.cc b/chrome/browser/profiles/profile_destroyer.cc
index fb16f81300ea899872517f65352e1b2c891455ab..7e8de0a72a4edf2deaa98163e2291c325f224531 100644
--- a/chrome/browser/profiles/profile_destroyer.cc
+++ b/chrome/browser/profiles/profile_destroyer.cc
@@ -5,6 +5,7 @@
 #include "chrome/browser/profiles/profile_destroyer.h"
 
 #include "base/bind.h"
+#include "base/debug/trace_event.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop/message_loop.h"
 #include "chrome/browser/profiles/profile.h"
@@ -23,6 +24,8 @@ std::vector<ProfileDestroyer*>* ProfileDestroyer::pending_destroyers_ = NULL;
 
 // static
 void ProfileDestroyer::DestroyProfileWhenAppropriate(Profile* const profile) {
+  TRACE_EVENT0("shutdown", "ProfileDestroyer::DestroyProfileWhenAppropriate");
+
   DCHECK(profile);
   profile->MaybeSendDestroyedNotification();