Adds TCMalloc support for Android.

third_party/tcmalloc/chromium/src/base/sysinfo.cc

 // Copyright (c) 2006, 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 485 matching lines @@
 
 // ----------------------------------------------------------------------
 // HasPosixThreads()
 //      Return true if we're running POSIX (e.g., NPTL on Linux)
 //      threads, as opposed to a non-POSIX thread libary.  The thing
 //      that we care about is whether a thread's pid is the same as
 //      the thread that spawned it.  If so, this function returns
 //      true.
 // ----------------------------------------------------------------------
 bool HasPosixThreads() {
-#if defined(__linux__)
+#if defined(__linux__) && !defined(__ANDROID__)

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

Let's add a comment that describes we can't do it in Android since Android
doesn't expose confstr() and we assume using POSIX threads in Android.

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

Done.

 #ifndef _CS_GNU_LIBPTHREAD_VERSION
 #define _CS_GNU_LIBPTHREAD_VERSION 3
 #endif
   char buf[32];
   //  We assume that, if confstr() doesn't know about this name, then
   //  the same glibc is providing LinuxThreads.
   if (confstr(_CS_GNU_LIBPTHREAD_VERSION, buf, sizeof(buf)) == 0)
     return false;
   return strncmp(buf, "NPTL", 4) == 0;
 #elif defined(PLATFORM_WINDOWS) || defined(__CYGWIN__) || defined(__CYGWIN32__)
@@ skipping 614 matching lines @@
   ProcMapsIterator::Buffer linebuf;
   while (it.Next(&start, &end, &flags, &offset, &inode, &filename)) {
     int written = it.FormatLine(linebuf.buf_, sizeof(linebuf.buf_),
                                 start, end, flags, offset, inode, filename,
                                 0);
     RawWrite(fd, linebuf.buf_, written);
   }
 }
 
 }  // namespace tcmalloc