Add use_allocator instead of linux_use_tcmalloc to switch the allocator.

base/base.gyp

 # Copyright (c) 2012 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.
 
 {
   'variables': {
     'chromium_code': 1,
   },
   'includes': [
     '../build/win_precompile.gypi',
@@ skipping 162 matching lines @@
         ['OS == "linux"', {
           'link_settings': {
             'libraries': [
               # We need rt for clock_gettime().
               '-lrt',
               # For 'native_library_linux.cc'
               '-ldl',
             ],
           },
           'conditions': [
-            ['linux_use_tcmalloc==0', {
+            # TODO(dmikurube): Kill linux_use_tcmalloc. http://crbug.com/345554
+            ['use_allocator!="tcmalloc" and (use_allocator!="see_use_tcmalloc" or linux_use_tcmalloc==0)', {
               'defines': [
                 'NO_TCMALLOC',
               ],
               'direct_dependent_settings': {
                 'defines': [
                   'NO_TCMALLOC',
                 ],
               },
             }],
           ],
@@ skipping 555 matching lines @@
         }, {  # use_glib == 0
           'sources!': [
             'message_loop/message_pump_glib_unittest.cc',
           ]
         }],
         ['use_ozone == 1', {
           'sources!': [
             'message_loop/message_pump_glib_unittest.cc',
           ]
         }],
-        ['OS == "linux" and linux_use_tcmalloc==1', {
+        # TODO(dmikurube): Kill linux_use_tcmalloc. http://crbug.com/345554
+        ['OS == "linux" and ((use_allocator!="none" and use_allocator!="see_use_tcmalloc") or (use_allocator=="see_use_tcmalloc" and linux_use_tcmalloc==1))', {
             'dependencies': [
               'allocator/allocator.gyp:allocator',
             ],
           },
         ],
         ['OS == "win"', {
           'sources!': [
             'file_descriptor_shuffle_unittest.cc',
             'files/dir_reader_posix_unittest.cc',
             'threading/worker_pool_posix_unittest.cc',
@@ skipping 675 matching lines @@
             'base_unittests.isolate',
           ],
           'sources': [
             'base_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }