heap: Add basic type aliases for cppgc

First batch of type aliases for cppgc which are just forwarding
existing Blink types to their cppgc counterparts.

Bug: chromium:1056170
Change-Id: I186ffd39e69feef2f96f1979c94c040f307e7926
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2527143
Commit-Queue: Michael Lippautz <mlippautz@chromium.org>
Auto-Submit: Michael Lippautz <mlippautz@chromium.org>
Reviewed-by: Omer Katz <omerkatz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#825611}

third_party/blink/renderer/platform/heap/BUILD.gn

@@ -77,6 +77,16 @@ blink_platform_sources("heap") {
     "visitor.h",
   ]
 
+  deps = [
+    ":blink_heap_buildflags",
+    "//base",
+    "//third_party/blink/renderer/platform:make_platform_generated",
+    "//third_party/blink/renderer/platform/heap:heap_unsanitized",
+    "//third_party/blink/renderer/platform/heap/asm",
+    "//third_party/icu",
+    "//v8",
+  ]
+
   if (enable_blink_heap_use_v8_oilpan) {
     sources += [
       "v8_wrapper/blink_gc.h",
@@ -97,6 +107,8 @@ blink_platform_sources("heap") {
       "v8_wrapper/unified_heap_marking_visitor.h",
       "v8_wrapper/visitor.h",
     ]
+
+    deps += [ "//v8:cppgc" ]
   } else {
     sources += [
       "impl/atomic_entry_flag.h",
@@ -155,16 +167,6 @@ blink_platform_sources("heap") {
     ]
   }
 
-  deps = [
-    ":blink_heap_buildflags",
-    "//base",
-    "//third_party/blink/renderer/platform:make_platform_generated",
-    "//third_party/blink/renderer/platform/heap:heap_unsanitized",
-    "//third_party/blink/renderer/platform/heap/asm",
-    "//third_party/icu",
-    "//v8",
-  ]
-
   if (!is_debug && !optimize_for_size) {
     configs -= [ "//build/config/compiler:default_optimization" ]
     configs += [ "//build/config/compiler:optimize_max" ]

third_party/blink/renderer/platform/heap/v8_wrapper/heap.h

@@ -5,6 +5,15 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_HEAP_H_
 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_HEAP_H_
 
-// TODO(chromium:1056170): Implement wrapper.
+#include "v8/include/cppgc/garbage-collected.h"
+
+namespace blink {
+
+template <typename T>
+using GarbageCollected = cppgc::GarbageCollected<T>;
+
+using GarbageCollectedMixin = cppgc::GarbageCollectedMixin;
+
+}  // namespace blink
 
 #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_HEAP_H_

third_party/blink/renderer/platform/heap/v8_wrapper/member.h

@@ -5,6 +5,19 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_MEMBER_H_
 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_MEMBER_H_
 
-// TODO(chromium:1056170): Implement wrapper.
+#include "v8/include/cppgc/member.h"
+
+namespace blink {
+
+template <typename T>
+using Member = cppgc::Member<T>;
+
+template <typename T>
+using WeakMember = cppgc::WeakMember<T>;
+
+template <typename T>
+using UntracedMember = cppgc::UntracedMember<T>;
+
+}  // namespace blink
 
 #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_MEMBER_H_

third_party/blink/renderer/platform/heap/v8_wrapper/persistent.h

@@ -5,6 +5,16 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_PERSISTENT_H_
 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_PERSISTENT_H_
 
-// TODO(chromium:1056170): Implement wrapper.
+#include "v8/include/cppgc/persistent.h"
+
+namespace blink {
+
+template <typename T>
+using Persistent = cppgc::Persistent<T>;
+
+template <typename T>
+using WeakPersistent = cppgc::WeakPersistent<T>;
+
+}  // namespace blink
 
 #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_PERSISTENT_H_

third_party/blink/renderer/platform/heap/v8_wrapper/thread_state.h

@@ -5,6 +5,13 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_THREAD_STATE_H_
 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_THREAD_STATE_H_
 
-// TODO(chromium:1056170): Implement wrapper.
+#include "v8/include/cppgc/prefinalizer.h"
+
+namespace blink {
+
+#define USING_PRE_FINALIZER(Class, PreFinalizer) \
+  CPPGC_USING_PRE_FINALIZER(Class, PreFinalizer)
+
+}  // namespace blink
 
 #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_THREAD_STATE_H_

third_party/blink/renderer/platform/heap/v8_wrapper/visitor.h

@@ -5,6 +5,12 @@
 #ifndef THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_VISITOR_H_
 #define THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_VISITOR_H_
 
-// TODO(chromium:1056170): Implement wrapper.
+#include "v8/include/cppgc/visitor.h"
+
+namespace blink {
+
+using Visitor = cppgc::Visitor;
+
+}  // namespace blink
 
 #endif  // THIRD_PARTY_BLINK_RENDERER_PLATFORM_HEAP_V8_WRAPPER_VISITOR_H_