content: Add layout_test_helper target.

build/all.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.
 
 {
   'targets': [
     {
       'target_name': 'All',
       'type': 'none',
       'xcode_create_dependents_test_runner': 1,
@@ skipping 381 matching lines @@
           'target_name': 'blink_tests',
           'type': 'none',
           'dependencies': [
             '../third_party/WebKit/public/all.gyp:all_blink',
             '../content/content_shell_and_tests.gyp:content_shell',
           ],
           'conditions': [
             ['OS=="win"', {
               'dependencies': [
                 '../content/content_shell_and_tests.gyp:content_shell_crash_service',
+                '../content/content_shell_and_tests.gyp:layout_test_helper',
               ],
             }, {  # OS!="win"
               'dependencies': [
                 '../breakpad/breakpad.gyp:minidump_stackwalk',
               ],
             }],
             ['OS=="mac"', {
               'dependencies': [
                 '../breakpad/breakpad.gyp:dump_syms#host',
+                '../content/content_shell_and_tests.gyp:layout_test_helper',
               ],
             }],
             ['OS=="linux"', {
               'dependencies': [
                 '../breakpad/breakpad.gyp:dump_syms',
               ],
             }],
           ],
         }, # target_name: blink_tests
         {
@@ skipping 632 matching lines @@
             '../chrome/chrome.gyp:interactive_ui_tests_run',
             '../chrome/chrome.gyp:sync_integration_tests_run',
             '../chrome/chrome.gyp:unit_tests_run',
             '../net/net.gyp:net_unittests_run',
           ],
         }, # target_name: chromium_swarm_tests
       ],
     }],
   ], # conditions
 }