Handle nested position:sticky elements

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("//cc/cc.gni")
 
 cc_component("cc") {
   sources = [
     "debug/benchmark_instrumentation.cc",
@@ skipping 825 matching lines @@
     "tiles/gpu_image_decode_cache_unittest.cc",
     "tiles/image_controller_unittest.cc",
     "tiles/mipmap_util_unittest.cc",
     "tiles/picture_layer_tiling_set_unittest.cc",
     "tiles/picture_layer_tiling_unittest.cc",
     "tiles/software_image_decode_cache_unittest.cc",
     "tiles/tile_manager_unittest.cc",
     "tiles/tile_priority_unittest.cc",
     "trees/blocking_task_runner_unittest.cc",
     "trees/damage_tracker_unittest.cc",
+    "trees/draw_property_utils_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_readback.cc",
     "trees/layer_tree_host_pixeltest_scrollbars.cc",
     "trees/layer_tree_host_pixeltest_synchronous.cc",
     "trees/layer_tree_host_pixeltest_tiles.cc",
     "trees/layer_tree_host_unittest.cc",
@@ skipping 137 matching lines @@
   data = [
     "test/data/",
 
     # Needed for isolate script to execute.
     "//testing/scripts/common.py",
     "//testing/xvfb.py",
     "//testing/scripts/run_gtest_perf_test.py",
     "//tools/perf/generate_legacy_perf_dashboard_json.py",
   ]
 }