Adds TCMalloc support for Android.

third_party/tcmalloc/chromium/src/maybe_threads.cc

 // Copyright (c) 2005, 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 106 matching lines @@
   }
   if (!__isthreaded) {
     init_routine();
     pthread_once_ran_before_threads = true;
     return 0;
   }
 #endif
   if (pthread_once) {
     return pthread_once(ctl, init_routine);
   } else {
-    if (memcmp(ctl, &pthread_once_init, sizeof(*ctl)) == 0) {
+    if (memcmp((const void*)(ctl),
+               (const void*)(&pthread_once_init),
+               sizeof(*ctl)) == 0) {

[Dai Mikurube (NOT FULLTIME), 2013/05/08 14:53:25]

Ok, then let's use C++ style cast.

[bulach, 2013/05/08 16:09:10]

:)
it's a double-cast, and not entirely sure it'd work on all platforms if they
have different typedef's for pthread_once.
using c++ style but with an ifdef for android to be safe.

[Dai Mikurube (NOT FULLTIME), 2013/05/09 16:29:28]

wow, it's long, but I believe it's the better way... ;)

       init_routine();
       ++*(char*)(ctl);        // make it so it's no longer equal to init
     }
     return 0;
   }
 }