cc: Separate the priority from the tile and put in new PrioritizedTile

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("//testing/test.gni")
 
 component("cc") {
   sources = [
     "animation/animation.cc",
     "animation/animation.h",
@@ skipping 367 matching lines @@
     "resources/picture_pile_impl.h",
     "resources/pixel_buffer_tile_task_worker_pool.cc",
     "resources/pixel_buffer_tile_task_worker_pool.h",
     "resources/pixel_ref_map.cc",
     "resources/pixel_ref_map.h",
     "resources/platform_color.h",
     "resources/prioritized_resource.cc",
     "resources/prioritized_resource.h",
     "resources/prioritized_resource_manager.cc",
     "resources/prioritized_resource_manager.h",
+    "resources/prioritized_tile.cc",
+    "resources/prioritized_tile.h",
     "resources/priority_calculator.cc",
     "resources/priority_calculator.h",
     "resources/raster_buffer.cc",
     "resources/raster_buffer.h",
     "resources/raster_source.h",
     "resources/raster_source_helper.cc",
     "resources/raster_source_helper.h",
     "resources/raster_tile_priority_queue.cc",
     "resources/raster_tile_priority_queue.h",
     "resources/raster_tile_priority_queue_all.cc",
@@ skipping 520 matching lines @@
     "//testing/gmock",
     "//testing/gtest",
     "//testing/perf",
     "//ui/gfx",
     "//ui/gfx/geometry",
     "//ui/gl",
   ]
 }
 # When adding support for isolates, please have a look at run-time dependencies
 # in the cc_unittests_run target in cc_tests.gyp.