Allow collection of DOM objects in minor GC cycles.

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 630 matching lines @@
 }
 
 
 void V8::MarkIndependent(i::Object** object) {
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "MakeIndependent");
   isolate->global_handles()->MarkIndependent(object);
 }
 
 
+void V8::MarkExternallyUnreachable(i::Object** object) {
+  i::Isolate* isolate = i::Isolate::Current();
+  LOG_API(isolate, "MarkExternallyUnreachable");
+  isolate->global_handles()->MarkExternallyUnreachable(object);
+}
+
+
 bool V8::IsGlobalIndependent(i::Object** obj) {
   i::Isolate* isolate = i::Isolate::Current();
   LOG_API(isolate, "IsGlobalIndependent");
   if (!isolate->IsInitialized()) return false;
   return i::GlobalHandles::IsIndependent(obj);
 }
 
 
 bool V8::IsGlobalNearDeath(i::Object** obj) {
   i::Isolate* isolate = i::Isolate::Current();
@@ skipping 5978 matching lines @@
 
   v->VisitPointers(blocks_.first(), first_block_limit_);
 
   for (int i = 1; i < blocks_.length(); i++) {
     v->VisitPointers(blocks_[i], &blocks_[i][kHandleBlockSize]);
   }
 }
 
 
 } }  // namespace v8::internal