[Mac] Add a perf test that counts the number of Mach ports in the browser.

chrome/chrome_tests.gypi

 # 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' : {
     'pyautolib_sources': [
       'app/chrome_command_ids.h',
       'app/chrome_dll_resource.h',
       'common/automation_constants.h',
       'common/pref_names.cc',
@@ skipping 3483 matching lines @@
               },
             },
           },
         }],
         ['OS=="mac"', {
           # See the comment in this section of the unit_tests target for an
           # explanation (crbug.com/43791 - libwebcore.a is too large to mmap).
           'dependencies+++': [
             '../third_party/WebKit/Source/WebCore/WebCore.gyp/WebCore.gyp:webcore',
           ],
+          'sources': [
+            'test/perf/mach_ports_test.cc',
+          ],
         }],
         ['toolkit_uses_gtk == 1', {
           'dependencies': [
             '../build/linux/system.gyp:gtk',
             '../tools/xdisplaycheck/xdisplaycheck.gyp:xdisplaycheck',
           ],
         }],
         ['os_posix == 1 and OS != "mac"', {
           'conditions': [
             ['linux_use_tcmalloc==1', {
@@ skipping 1091 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],  # 'actions'
         },
       ]
     }],  # 'coverage!=0'
   ],  # 'conditions'
 }