Add DCLayerOverlayProcessor and supporting DCLayer structures.

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 164 matching lines @@
     "output/compositor_frame_sink.h",
     "output/compositor_frame_sink_client.h",
     "output/context_cache_controller.cc",
     "output/context_cache_controller.h",
     "output/context_provider.cc",
     "output/context_provider.h",
     "output/copy_output_request.cc",
     "output/copy_output_request.h",
     "output/copy_output_result.cc",
     "output/copy_output_result.h",
+    "output/dc_layer_overlay.cc",
+    "output/dc_layer_overlay.h",
     "output/direct_renderer.cc",
     "output/direct_renderer.h",
     "output/dynamic_geometry_binding.cc",
     "output/dynamic_geometry_binding.h",
     "output/filter_operation.cc",
     "output/filter_operation.h",
     "output/filter_operations.cc",
     "output/filter_operations.h",
     "output/geometry_binding.cc",
     "output/geometry_binding.h",
@@ skipping 805 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",
   ]
 }