[WIP] New GC related APIs.

include/v8.h

Index: include/v8.h
diff --git a/include/v8.h b/include/v8.h
index a43446639749441a888509ee2f81ac97f5efded0..bece681a48b630fb7aea2f3e20823867761de399 100644
--- a/include/v8.h
+++ b/include/v8.h
@@ -142,6 +142,28 @@ class Isolate;
 class Object;
 }
 
+// Generic-purpose unique identifier.
+class UniqueId {
+ public:
+  explicit UniqueId(intptr_t data)
+      : data_(data) {}
+
+  bool operator==(const UniqueId& other) const {
+    return data_ == other.data_;
+  }
+
+  bool operator!=(const UniqueId& other) const {
+    return data_ != other.data_;
+  }
+
+  bool operator<(const UniqueId& other) const {
+    return data_ < other.data_;
+  }
+
+ private:
+  intptr_t data_;
+};
+
 
 // --- Weak Handles ---
 
@@ -3443,6 +3465,8 @@ class V8EXPORT V8 {
    * for partially dependent handles only.
    * See v8-profiler.h for RetainedObjectInfo interface description.
    */
+  // TODO(marja): deprecate AddObjectGroup. Use SetObjectGroupID and
+  // SetRetainedObjectInfo instead.
   static void AddObjectGroup(Persistent<Value>* objects,
                              size_t length,
                              RetainedObjectInfo* info = NULL);
@@ -3451,6 +3475,14 @@ class V8EXPORT V8 {
                              size_t length,
                              RetainedObjectInfo* info = NULL);
 
+  static void SetObjectGroupId(Isolate* isolate,
+                               const Persistent<Value>& object,
+                               UniqueId id);
+
+  static void SetRetainedObjectInfo(Isolate* isolate,
+                                    UniqueId id,
+                                    RetainedObjectInfo* info);
+
   /**
    * Allows the host application to declare implicit references between
    * the objects: if |parent| is alive, all |children| are alive too.