scheduler: Implement task observers

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 642 matching lines @@
       'renderer/media/render_media_log_unittest.cc',
       'renderer/media/video_capture_impl_manager_unittest.cc',
       'renderer/media/video_capture_impl_unittest.cc',
       'renderer/media/video_capture_message_filter_unittest.cc',
       'renderer/render_thread_impl_unittest.cc',
       'renderer/render_widget_unittest.cc',
       'renderer/scheduler/renderer_scheduler_impl_unittest.cc',
       'renderer/scheduler/renderer_task_queue_selector_unittest.cc',
       'renderer/scheduler/resource_dispatch_throttler_unittest.cc',
       'renderer/scheduler/task_queue_manager_unittest.cc',
+      'renderer/scheduler/webthread_impl_for_scheduler_unittest.cc',
       'renderer/screen_orientation/screen_orientation_dispatcher_unittest.cc',
       'renderer/skia_benchmarking_extension_unittest.cc',
       'test/fileapi_test_file_set.cc',
       'test/fileapi_test_file_set.h',
       'test/image_decoder_test.cc',
       'test/image_decoder_test.h',
       'test/run_all_unittests.cc',
     ],
     'content_unittests_speech_sources': [
       'browser/speech/chunked_byte_buffer_unittest.cc',
@@ skipping 1469 matching lines @@
                   'files': ['<(PRODUCT_DIR)/libnpapi_test_plugin.so'],
                 },
               ],
             }],
           ],
         },
       ],
     }],
   ],
 }