Adds TCMalloc support for Android.

third_party/tcmalloc/chromium/src/maybe_threads.cc

Index: third_party/tcmalloc/chromium/src/maybe_threads.cc
diff --git a/third_party/tcmalloc/chromium/src/maybe_threads.cc b/third_party/tcmalloc/chromium/src/maybe_threads.cc
index 15c8a23dcb3509549ef6b45531f2418e988a3cf5..87054d00039939d08411d602a03a3491ab92e86d 100644
--- a/third_party/tcmalloc/chromium/src/maybe_threads.cc
+++ b/third_party/tcmalloc/chromium/src/maybe_threads.cc
@@ -124,7 +124,9 @@ int perftools_pthread_once(pthread_once_t *ctl,
   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
     }