Update the tcmalloc chromium branch to r144 (gperftools 2.0), and merge chromium-specific changes.

third_party/tcmalloc/chromium/src/base/spinlock_posix-inl.h

 /* Copyright (c) 2009, Google Inc.
  * All rights reserved.
  * 
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  * 
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 31 matching lines @@
 namespace internal {
 
 void SpinLockDelay(volatile Atomic32 *w, int32 value, int loop) {
   int save_errno = errno;
   if (loop == 0) {
   } else if (loop == 1) {
     sched_yield();
   } else {
     struct timespec tm;
     tm.tv_sec = 0;
-    tm.tv_nsec = 1000000;
+    tm.tv_nsec = base::internal::SuggestedDelayNS(loop);
     nanosleep(&tm, NULL);
   }
   errno = save_errno;
 }
 
 void SpinLockWake(volatile Atomic32 *w, bool all) {
 }
 
 } // namespace internal
 } // namespace base