cc: Simplify Task and its derived classes.

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.
 
 import("//build/config/ui.gni")
 import("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
@@ skipping 357 matching lines @@
     "raster/raster_buffer.cc",
     "raster/raster_buffer.h",
     "raster/scoped_gpu_raster.cc",
     "raster/scoped_gpu_raster.h",
     "raster/single_thread_task_graph_runner.cc",
     "raster/single_thread_task_graph_runner.h",
     "raster/staging_buffer_pool.cc",
     "raster/staging_buffer_pool.h",
     "raster/synchronous_task_graph_runner.cc",
     "raster/synchronous_task_graph_runner.h",
+    "raster/task.cc",
+    "raster/task.h",
     "raster/task_category.h",
     "raster/task_graph_runner.cc",
     "raster/task_graph_runner.h",
     "raster/task_graph_work_queue.cc",
     "raster/task_graph_work_queue.h",
+    "raster/task_types.h",
     "raster/texture_compressor.cc",
     "raster/texture_compressor.h",
     "raster/texture_compressor_etc1.cc",
     "raster/texture_compressor_etc1.h",
-    "raster/tile_task_runner.cc",
-    "raster/tile_task_runner.h",
     "raster/tile_task_worker_pool.cc",
     "raster/tile_task_worker_pool.h",
     "raster/zero_copy_tile_task_worker_pool.cc",
     "raster/zero_copy_tile_task_worker_pool.h",
     "resources/memory_history.cc",
     "resources/memory_history.h",
     "resources/platform_color.h",
     "resources/release_callback.h",
     "resources/resource.h",
     "resources/resource_format.cc",
@@ skipping 605 matching lines @@
     "//ui/gl",
     "//ui/gl:test_support",
   ]
 
   if (is_android) {
     isolate_file = "cc_perftests.isolate"
   }
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.