Adds TCMalloc support for Android.

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

Index: third_party/tcmalloc/chromium/src/base/sysinfo.cc
diff --git a/third_party/tcmalloc/chromium/src/base/sysinfo.cc b/third_party/tcmalloc/chromium/src/base/sysinfo.cc
index 82f3f56a90e71ef81f7ecc7b4e2c566025223a33..23eeb5abe830ab7c87f148d97b3e3c9c8e7a033f 100644
--- a/third_party/tcmalloc/chromium/src/base/sysinfo.cc
+++ b/third_party/tcmalloc/chromium/src/base/sysinfo.cc
@@ -1,10 +1,10 @@
 // Copyright (c) 2006, Google Inc.
 // All rights reserved.
-// 
+//

[Dai Mikurube (NOT FULLTIME), 2013/05/03 08:53:00]

nit: unnecessary whitespace deletion

[bulach, 2013/05/07 14:55:51]

Done.

 // 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
@@ -14,7 +14,7 @@
 //     * Neither the name of Google Inc. nor the names of its
 // contributors may be used to endorse or promote products derived from
 // this software without specific prior written permission.
-// 
+//
 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
@@ -503,7 +503,7 @@ int NumCPUs(void) {
 //      true.
 // ----------------------------------------------------------------------
 bool HasPosixThreads() {
-#if defined(__linux__)
+#if defined(__linux__) && !defined(__ANDROID__)

[Dai Mikurube (NOT FULLTIME), 2013/05/03 08:53:00]

just curious.  what happens without this?

[bulach, 2013/05/07 14:55:51]

'confstr' was not declared in this scope.
I suppose that pthread.h is what it's meant by "POSIX thread" here?

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

I think so.  Then, yes, we should return true on Android like this.

+ a comment on the patch set 6.

 #ifndef _CS_GNU_LIBPTHREAD_VERSION
 #define _CS_GNU_LIBPTHREAD_VERSION 3
 #endif