Enable TCMalloc on Linux by default.

chrome/chrome_renderer.gypi

 # 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': 'renderer',
       'type': '<(library)',
       'msvs_guid': '9301A569-5D2B-4D11-9332-B1E30AEACB8D',
@@ skipping 166 matching lines @@
         ],
       },
       'conditions': [
         ['disable_nacl!=1', {
           'dependencies': [
             'nacl',
           ],
         }],
         # Linux-specific rules.
         ['OS=="linux"', {
+          'conditions': [
+            [ 'linux_use_tcmalloc==1', {
+                'dependencies': [
+                  '../base/allocator/allocator.gyp:allocator',
+                ],
+              },
+            ],
+          ],
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../sandbox/sandbox.gyp:sandbox',
           ],
         }],
         # BSD-specific rules.
         ['OS=="openbsd" or OS=="freebsd"', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
           ],
@@ skipping 26 matching lines @@
       ],
     },
   ],
 }
 
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