Add convenience method for converting v8::PersistentBase to v8::Local

test/cctest/test-global-handles.cc

Index: test/cctest/test-global-handles.cc
diff --git a/test/cctest/test-global-handles.cc b/test/cctest/test-global-handles.cc
index ee295d6991cce0db19cdfebb090aba1aea99ba73..20aaeac73eea5d10a1d7dadc31e179aaebe36a9c 100644
--- a/test/cctest/test-global-handles.cc
+++ b/test/cctest/test-global-handles.cc
@@ -380,3 +380,20 @@ TEST(EternalHandles) {
 
   CHECK_EQ(2*kArrayLength + 1, eternal_handles->NumberOfHandles());
 }
+
+
+TEST(PersistentBaseGetLocal) {
+  CcTest::InitializeVM();
+  v8::Isolate* isolate = CcTest::isolate();
+
+  v8::HandleScope scope(isolate);
+  v8::Local<v8::Object> o = v8::Object::New(isolate);
+  CHECK(!o.IsEmpty());
+  v8::Persistent<v8::Object> p(isolate, o);
+  CHECK(o == p.Get(isolate));
+  CHECK(v8::Local<v8::Object>::New(isolate, p) == p.Get(isolate));
+
+  v8::Global<v8::Object> g(isolate, o);
+  CHECK(o == g.Get(isolate));
+  CHECK(v8::Local<v8::Object>::New(isolate, g) == g.Get(isolate));
+}