Pull out a base class from DumpAccessibilityTree

content/content_tests.gypi

 # Copyright (c) 2013 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': {
     'layouttest_support_content_sources': [
       'public/test/layouttest_support.h',
       'public/test/nested_message_pump_android.cc',
       'public/test/nested_message_pump_android.h',
@@ skipping 1191 matching lines @@
             'HAS_OUT_OF_PROC_TEST_RUNNER',
           ],
           'sources': [
             'app/mojo/mojo_browsertest.cc',
             'browser/accessibility/accessibility_ipc_error_browsertest.cc',
             'browser/accessibility/accessibility_mode_browsertest.cc',
             'browser/accessibility/accessibility_win_browsertest.cc',
             'browser/accessibility/android_granularity_movement_browsertest.cc',
             'browser/accessibility/android_hit_testing_browsertest.cc',
             'browser/accessibility/cross_platform_accessibility_browsertest.cc',
+            'browser/accessibility/dump_accessibility_browsertest_base.cc',
+            'browser/accessibility/dump_accessibility_browsertest_base.h',
             'browser/accessibility/dump_accessibility_tree_browsertest.cc',
             'browser/accessibility/site_per_process_accessibility_browsertest.cc',
             'browser/battery_status/battery_status_browsertest.cc',
             'browser/compositor/image_transport_factory_browsertest.cc',
             'browser/bookmarklet_browsertest.cc',
             'browser/child_process_launcher_browsertest.cc',
             'browser/child_process_security_policy_browsertest.cc',
             'browser/cross_site_transfer_browsertest.cc',
             'browser/database_browsertest.cc',
             'browser/device_sensors/device_inertial_sensor_browsertest.cc',
@@ skipping 808 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }