[heap] Implement concurrent marking boilerplate.

test/cctest/BUILD.gn

 # Copyright 2016 The V8 project 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("../../gni/v8.gni")
 
 v8_executable("cctest") {
   testonly = true
 
   sources = [
@@ skipping 55 matching lines @@
     "gay-precision.cc",
     "gay-precision.h",
     "gay-shortest.cc",
     "gay-shortest.h",
     "heap/heap-tester.h",
     "heap/heap-utils.cc",
     "heap/heap-utils.h",
     "heap/test-alloc.cc",
     "heap/test-array-buffer-tracker.cc",
     "heap/test-compaction.cc",
+    "heap/test-concurrent-marking.cc",
     "heap/test-heap.cc",
     "heap/test-incremental-marking.cc",
     "heap/test-lab.cc",
     "heap/test-mark-compact.cc",
     "heap/test-page-promotion.cc",
     "heap/test-spaces.cc",
     "interpreter/bytecode-expectations-printer.cc",
     "interpreter/bytecode-expectations-printer.h",
     "interpreter/interpreter-tester.cc",
     "interpreter/interpreter-tester.h",
@@ skipping 346 matching lines @@
   ]
 
   deps = [
     "../..:v8",
     "../..:v8_libbase",
     "../..:v8_libplatform",
     "//build/config/sanitizers:deps",
     "//build/win:default_exe_manifest",
   ]
 }