Implement IsIndependent(Isolate*)

src/api.cc

Index: src/api.cc
diff --git a/src/api.cc b/src/api.cc
index be7d73f50906edcf0343d326e592520b71195285..f75fe65a57a4600170343eb2bb397a2c9ada31a2 100644
--- a/src/api.cc
+++ b/src/api.cc
@@ -656,6 +656,14 @@ bool V8::IsGlobalIndependent(i::Object** obj) {
 }
 
 
+bool V8::IsGlobalIndependent(i::Isolate* isolate, i::Object** obj) {
+  ASSERT(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();
   LOG_API(isolate, "IsGlobalNearDeath");