Enable TCMalloc on Linux by default.

base/process_util_unittest.cc

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define _CRT_SECURE_NO_WARNINGS
 
 #include <limits>
 
 #include "base/command_line.h"
 #include "base/eintr_wrapper.h"
@@ skipping 346 matching lines @@
       "0 0 0 0 "  // <- No CPU, apparently.
       "16 0 1 0 1676099790 2957312 114 4294967295 134512640 134528148 "
       "3221224832 3221224344 3086339742 0 0 0 0 0 0 0 17 0 0 0";
 
   EXPECT_EQ(0, ParseProcStatCPU(kSelfStat));
 }
 #endif
 
 #endif  // defined(OS_POSIX)
 
+// TODO(vandebo) make this work on Windows and Mac too.
 #if defined(OS_LINUX)
-// TODO(vandebo) make this work on Windows and Mac too.
+
+#if defined(LINUX_USE_TCMALLOC)
+extern "C" {
+int tc_set_new_mode(int mode);
+}
+#endif  // defined(LINUX_USE_TCMALLOC)
 
 class OutOfMemoryTest : public testing::Test {
  public:
   OutOfMemoryTest()
       : value_(NULL),
         // Make test size as large as possible minus a few pages so
         // that alignment or other rounding doesn't make it wrap.
         test_size_(std::numeric_limits<std::size_t>::max() - 8192) {
   }
 
   virtual void SetUp() {
     // Must call EnableTerminationOnOutOfMemory() because that is called from
     // chrome's main function and therefore hasn't been called yet.
     EnableTerminationOnOutOfMemory();
+#if defined(LINUX_USE_TCMALLOC)
+    tc_set_new_mode(1);
+  }
+
+  virtual void TearDown() {
+    tc_set_new_mode(0);
+#endif  // defined(LINUX_USE_TCMALLOC)
   }
 
   void* value_;
   size_t test_size_;
 };
 
 TEST_F(OutOfMemoryTest, New) {
   ASSERT_DEATH(value_ = new char[test_size_], "");
 }
 
@@ skipping 56 matching lines @@
   ASSERT_DEATH(value_ = __libc_pvalloc(test_size_), "");
 }
 
 TEST_F(OutOfMemoryTest, __libc_memalign) {
   ASSERT_DEATH(value_ = __libc_memalign(4, test_size_), "");
 }
 
 #endif  // defined(OS_LINUX)
 
 }  // namespace base