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 ee8e6f58e7860af7ca7b34e22f733a52a406438b..bc4e5287ccda92e9fac71cfd5063c1b10bd9afa3 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.
-// 
+//
 // 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
@@ -494,7 +494,9 @@ int NumCPUs(void) {
 //      true.
 // ----------------------------------------------------------------------
 bool HasPosixThreads() {
-#if defined(__linux__)
+#if defined(__ANDROID__)
+  return true;
+#elif defined(__linux__)

[Peter Beverloo, 2013/04/29 17:03:31]

It defaults to true by default.  We can avoid this extra branch by changing the
original define to read "#if defined(__linux__) and !defined(__ANDROID__)".

[bulach, 2013/04/30 18:43:08]

Done.

 #ifndef _CS_GNU_LIBPTHREAD_VERSION
 #define _CS_GNU_LIBPTHREAD_VERSION 3
 #endif