Enable TCMalloc on Linux by default.

third_party/tcmalloc/tcmalloc.gyp

 # 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.
 
 {
   'targets': [
     {
       'target_name': 'tcmalloc',
       'type': '<(library)',
       'msvs_guid': 'C564F145-9172-42C3-BFCB-60FDEA124321',
@@ skipping 103 matching lines @@
         'tcmalloc/src/raw_printer.h',
 
         # tcmalloc forked files
         'allocator_shim.cc',
         'generic_allocators.cc',
         'page_heap.cc',
         'page_heap.h',
         'port.cc',
         'system-alloc.h',
         'tcmalloc.cc',
+        'tcmalloc_linux.cc',
         'win_allocator.cc',        
 
         # jemalloc files
         'jemalloc/jemalloc.c',
         'jemalloc/jemalloc.h',
         'jemalloc/ql.h',
         'jemalloc/qr.h',
         'jemalloc/rb.h',
       ],
       # sources! means that these are not compiled directly.
@@ skipping 43 matching lines @@
             'tcmalloc/src/symbolize.cc',
             'tcmalloc/src/symbolize.h',
             'tcmalloc/src/system-alloc.cc',
             'tcmalloc/src/system-alloc.h',
 
             # use forked version in windows
             'tcmalloc/src/tcmalloc.cc',
             'tcmalloc/src/page_heap.cc',
             'tcmalloc/src/page_heap.h',
 
+            # don't use linux forked version
+            'tcmalloc_linux.cc',
+
             # heap-profiler/checker/cpuprofiler
             'tcmalloc/src/base/thread_lister.c',
             'tcmalloc/src/base/thread_lister.h',
             'tcmalloc/src/heap-checker-bcad.cc',
             'tcmalloc/src/heap-checker.cc',
             'tcmalloc/src/heap-profiler.cc',
             'tcmalloc/src/memory_region_map.cc',
             'tcmalloc/src/memory_region_map.h',
             'tcmalloc/src/profiledata.cc',
             'tcmalloc/src/profiledata.h',
             'tcmalloc/src/profile-handler.cc',
             'tcmalloc/src/profile-handler.h',
             'tcmalloc/src/profiler.cc',
           ],
         }],
         ['OS=="linux"', {
           'sources!': [
             'page_heap.cc',
             'port.cc',
             'system-alloc.h',
             'win_allocator.cc',        
 
+            # TODO(willchan): unfork this
+            'tcmalloc/src/tcmalloc.cc',
+
             # TODO(willchan): Support allocator shim later on.
             'allocator_shim.cc',
 
             # TODO(willchan): support jemalloc on other platforms
             # jemalloc files
             'jemalloc/jemalloc.c',
             'jemalloc/jemalloc.h',
             'jemalloc/ql.h',
             'jemalloc/qr.h',
             'jemalloc/rb.h',
@@ skipping 60 matching lines @@
       ],
     }],
   ],
 }
 
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