cc: Use correct message loop proxy in BlockingTaskRunner

cc/BUILD.gn

 # Copyright 2014 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.
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
     "animation/animation_curve.cc",
     "animation/animation_curve.h",
@@ skipping 381 matching lines @@
     "resources/scoped_gpu_raster.h",
     "resources/scoped_resource.cc",
     "resources/scoped_resource.h",
     "resources/scoped_ui_resource.cc",
     "resources/scoped_ui_resource.h",
     "resources/shared_bitmap.cc",
     "resources/shared_bitmap.h",
     "resources/shared_bitmap_manager.h",
     "resources/single_release_callback.cc",
     "resources/single_release_callback.h",
+    "resources/single_release_callback_impl.cc",
+    "resources/single_release_callback_impl.h",
     "resources/skpicture_content_layer_updater.cc",
     "resources/skpicture_content_layer_updater.h",
     "resources/task_graph_runner.cc",
     "resources/task_graph_runner.h",
     "resources/texture_mailbox.cc",
     "resources/texture_mailbox_deleter.cc",
     "resources/texture_mailbox_deleter.h",
     "resources/texture_mailbox.h",
     "resources/texture_uploader.cc",
     "resources/texture_uploader.h",
@@ skipping 305 matching lines @@
     "resources/texture_mailbox_deleter_unittest.cc",
     "resources/texture_uploader_unittest.cc",
     "resources/tile_manager_unittest.cc",
     "resources/tile_priority_unittest.cc",
     "resources/video_resource_updater_unittest.cc",
     "scheduler/delay_based_time_source_unittest.cc",
     "scheduler/scheduler_state_machine_unittest.cc",
     "scheduler/scheduler_unittest.cc",
     "test/layer_tree_json_parser_unittest.cc",
     "test/test_web_graphics_context_3d_unittest.cc",
+    "trees/blocking_task_runner_unittest.cc",
     "trees/damage_tracker_unittest.cc",
     "trees/layer_sorter_unittest.cc",
     "trees/layer_tree_host_common_unittest.cc",
     "trees/layer_tree_host_impl_unittest.cc",
     "trees/layer_tree_host_pixeltest_blending.cc",
     "trees/layer_tree_host_pixeltest_filters.cc",
     "trees/layer_tree_host_pixeltest_masks.cc",
     "trees/layer_tree_host_pixeltest_on_demand_raster.cc",
     "trees/layer_tree_host_pixeltest_readback.cc",
     "trees/layer_tree_host_unittest.cc",
@@ skipping 66 matching lines @@
     "//gpu/command_buffer/common:gles2_utils",
     "//media",
     "//skia",
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
   ]
 }