Revert of cc: Remove WorkerPool class and instead use TaskGraphRunner directly.

cc/cc_tests.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.
 
 {
   'variables': {
     'chromium_code': 1,
     'cc_unit_tests_source_files': [
       'animation/animation_unittest.cc',
       'animation/keyframed_animation_curve_unittest.cc',
@@ skipping 49 matching lines @@
       'resources/picture_layer_tiling_unittest.cc',
       'resources/picture_pile_impl_unittest.cc',
       'resources/picture_pile_unittest.cc',
       'resources/picture_unittest.cc',
       'resources/prioritized_resource_unittest.cc',
       'resources/prioritized_tile_set_unittest.cc',
       'resources/raster_worker_pool_unittest.cc',
       'resources/resource_provider_unittest.cc',
       'resources/resource_update_controller_unittest.cc',
       'resources/scoped_resource_unittest.cc',
-      'resources/task_graph_runner_unittest.cc',
       'resources/texture_mailbox_deleter_unittest.cc',
       'resources/tile_manager_unittest.cc',
       'resources/tile_priority_unittest.cc',
       'resources/video_resource_updater_unittest.cc',
+      'resources/worker_pool_unittest.cc',
       'scheduler/delay_based_time_source_unittest.cc',
       'scheduler/frame_rate_controller_unittest.cc',
       'scheduler/rolling_time_delta_history_unittest.cc',
       'scheduler/scheduler_state_machine_unittest.cc',
       'scheduler/scheduler_unittest.cc',
       'scheduler/texture_uploader_unittest.cc',
       'test/layer_tree_json_parser_unittest.cc',
       'test/test_web_graphics_context_3d_unittest.cc',
       'trees/damage_tracker_unittest.cc',
       'trees/layer_sorter_unittest.cc',
@@ skipping 193 matching lines @@
         '../testing/perf/perf_test.gyp:*',
         '../ui/gfx/gfx.gyp:gfx',
         '../ui/gfx/gfx.gyp:gfx_geometry',
         'cc.gyp:cc',
         'cc_test_support',
       ],
       'sources': [
         'layers/layer_perftest.cc',
         'resources/picture_layer_tiling_perftest.cc',
         'resources/raster_worker_pool_perftest.cc',
-        'resources/task_graph_runner_perftest.cc',
         'resources/tile_manager_perftest.cc',
+        'resources/worker_pool_perftest.cc',
         'test/cc_test_suite.cc',
         'test/lap_timer.cc',
         'test/run_all_perftests.cc',
         'trees/layer_tree_host_common_perftest.cc',
         'trees/layer_tree_host_perftest.cc',
       ],
       'include_dirs': [
         'test',
         '.',
       ],
@@ skipping 125 matching lines @@
               'test_suite_name': 'cc_perftests',
               'input_shlib_path': '<(SHARED_LIB_DIR)/<(SHARED_LIB_PREFIX)cc_perftests<(SHARED_LIB_SUFFIX)',
             },
             'includes': [ '../build/apk_test.gypi' ],
           },
         ],
       }
     ]
   ],
 }