cppgc: Duplicate worklist

The worklist in this CL is a merge of the worklists of Oilpan and V8. This implementation supports both use cases and should serve as the shared worklist once we start merging the codebase.

Bug: chromium:1056170
Change-Id: I4ecdb475f3900c33eced9249efa112a69c1b2707
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2170828Reviewed-by: Anton Bikineev <bikineev@chromium.org>
Reviewed-by: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Commit-Queue: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#67459}

BUILD.gn

@@ -4055,6 +4055,7 @@ v8_source_set("cppgc_base") {
     "src/heap/cppgc/source-location.cc",
     "src/heap/cppgc/stack.cc",
     "src/heap/cppgc/stack.h",
+    "src/heap/cppgc/worklist.h",
   ]
 
   if (is_clang || !is_win) {

include/cppgc/trace-trait.h

@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef V8_HEAP_CPPGC_TRACE_TRAIT_H_
-#define V8_HEAP_CPPGC_TRACE_TRAIT_H_
+#ifndef INCLUDE_CPPGC_TRACE_TRAIT_H_
+#define INCLUDE_CPPGC_TRACE_TRAIT_H_
 
 #include <type_traits>
 #include "cppgc/type-traits.h"
@@ -64,4 +64,4 @@ struct TraceTraitImpl<T, true> {
 }  // namespace internal
 }  // namespace cppgc
 
-#endif  // V8_HEAP_CPPGC_TRACE_TRAIT_H_
+#endif  // INCLUDE_CPPGC_TRACE_TRAIT_H_

test/unittests/BUILD.gn

@@ -61,6 +61,7 @@ v8_source_set("cppgc_unittests_sources") {
     "heap/cppgc/tests.cc",
     "heap/cppgc/tests.h",
     "heap/cppgc/visitor_unittest.cc",
+    "heap/cppgc/worklist_unittest.cc",
   ]
 
   configs = [