Add a simple about:tcmalloc page that just displays its canned stats....

chrome/chrome.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,
 
     # Define the common dependencies that contain all the actual
     # Chromium functionality.  This list gets pulled in below by
@@ skipping 2375 matching lines @@
         ['OS=="win"', {
           'defines': [
             '__STD_C',
             '_CRT_SECURE_NO_DEPRECATE',
             '_SCL_SECURE_NO_DEPRECATE',
           ],
           'include_dirs': [
             'third_party/wtl/include',
           ],
           'dependencies': [
+            '../gears/gears.gyp:gears',
             '../google_update/google_update.gyp:google_update',
+            '../third_party/cld/cld.gyp:cld',
+            '../third_party/tcmalloc/tcmalloc.gyp:tcmalloc',
+            '../views/views.gyp:views',
             'installer/installer.gyp:installer_util',
-            '../third_party/cld/cld.gyp:cld',
-            '../views/views.gyp:views',
-            '../gears/gears.gyp:gears',
           ],
           'export_dependent_settings': [
             '../views/views.gyp:views',
           ],
           'sources': [
             'browser/net/ssl_config_service_manager_system.cc',
             # Using built-in rule in vstudio for midl.
             'browser/history/history_indexer.idl',
           ],
           'sources!': [
@@ skipping 4193 matching lines @@
               'dependencies': [
                 '../third_party/pthreads-win32/pthreads.gyp:pthreads',
               ],
             }],
           ],
         },
       ],  # targets when chrome_personalization==1 and use_syncapi_stub==0
     }],
   ],  # 'conditions'
 }