Provide DllMain, and hook to support TLS callbacks.

base/tracked_objects.cc

Index: base/tracked_objects.cc
===================================================================
--- base/tracked_objects.cc	(revision 112112)
+++ base/tracked_objects.cc	(working copy)
@@ -228,8 +228,6 @@
   // that the allocator is no longer active on this thread.
   if (!kTrackAllTaskObjects)
     return;  // Not compiled in.
-  if (!thread_data)
-    return;
   reinterpret_cast<ThreadData*>(thread_data)->OnThreadTerminationCleanup();
 }
 
@@ -525,7 +523,6 @@
   // Verify that we've at least shutdown/cleanup the major namesd threads.  The
   // caller should tell us how many thread shutdowns should have taken place by
   // now.
-  return;  // TODO(jar): until this is working on XP, don't run the real test.
   CHECK_GT(cleanup_count_, major_threads_shutdown_count);
 }