Enable TCMalloc on Linux by default.

webkit/tools/test_shell/test_shell.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.
 
 {
   'variables': {
     'chromium_code': 1,
     'test_shell_windows_resource_files': [
       'resources/test_shell.rc',
       'resources/pan_east.cur',
@@ skipping 272 matching lines @@
             # automatically from direct_dependent_settings in
             # their various targets (net.gyp:net_resources, etc.),
             # but that causes errors in other targets when
             # resulting .res files get referenced multiple times.
             '<(SHARED_INTERMEDIATE_DIR)/net/net_resources.rc',
             '<(SHARED_INTERMEDIATE_DIR)/webkit/webkit_resources.rc',
             '<(SHARED_INTERMEDIATE_DIR)/webkit/webkit_strings_en-US.rc',
           ],
         }],
         ['OS=="linux"', {
+          'conditions': [
+            [ 'linux_use_tcmalloc==1', {
+                'dependencies': [
+                  '../../../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
+                ],
+              },
+            ],
+          ],
           'dependencies': [
             '../../../build/linux/system.gyp:gtk',
             'test_shell_resources',
             'test_shell_pak',
           ],
         }],
         ['OS=="mac"', {
           'product_name': 'TestShell',
           'dependencies': ['layout_test_helper'],
           'variables': {
@@ skipping 403 matching lines @@
       ],
     }],
   ],
 }
 
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 # tab-width:2
 # indent-tabs-mode:nil
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