Don't use PostTask queueing between compositor and main thread.

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 235 matching lines @@
       'browser/media/session/media_session_browsertest.cc',
       'browser/media/session/media_session_delegate_default_browsertest.cc',
       'browser/media/session/media_session_visibility_browsertest.cc',
       'browser/media/session/mock_media_session_observer.cc',
       'browser/media/session/mock_media_session_observer.h',
       'browser/memory/memory_coordinator_browsertest.cc',
       'browser/memory/memory_pressure_controller_impl_browsertest.cc',
       'browser/message_port_provider_browsertest.cc',
       'browser/net_info_browsertest.cc',
       'browser/renderer_host/input/composited_scrolling_browsertest.cc',
+      'browser/renderer_host/input/main_thread_event_queue_browsertest.cc',
       'browser/renderer_host/input/non_blocking_event_browsertest.cc',
       'browser/renderer_host/input/touch_action_browsertest.cc',
       'browser/renderer_host/input/touch_input_browsertest.cc',
       'browser/renderer_host/input/touch_selection_controller_client_aura_browsertest.cc',
       'browser/renderer_host/render_process_host_browsertest.cc',
       'browser/renderer_host/render_view_host_browsertest.cc',
       'browser/renderer_host/render_widget_host_view_browsertest.cc',
       'browser/resource_loading_browsertest.cc',
       'browser/screen_orientation/screen_orientation_browsertest.cc',
       'browser/security_exploit_browsertest.cc',
@@ skipping 1656 matching lines @@
                   'content_unittests_apk.isolate',
                 ],
               },
             ],
           },
         ],
       ],
     }],
   ],
 }