Add EscapableHandleScope to api to fix problems with HandleScope::Close

test/cctest/test-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 20575 matching lines @@
   Local<Object> data2 = v8::Object::New();
   function_new_expected_env = data2;
   Local<Function> func2 = Function::New(isolate, FunctionNewCallback, data2);
   CHECK(!func2->IsNull());
   CHECK_NE(func, func2);
   env->Global()->Set(v8_str("func2"), func2);
   Local<Value> result2 = CompileRun("func2();");
   CHECK_EQ(v8::Integer::New(17, isolate), result2);
 }
 
+
+TEST(EscapeableHandleScope) {
+  HandleScope outer_scope(CcTest::isolate());
+  LocalContext context;
+  const int runs = 10;
+  Local<String> values[runs];
+  for (int i = 0; i < runs; i++) {
+    v8::EscapableHandleScope inner_scope(CcTest::isolate());
+    Local<String> value;
+    if (i != 0) value = v8_str("escape value");
+    values[i] = inner_scope.Escape(value);
+  }
+  for (int i = 0; i < runs; i++) {
+    Local<String> expected;
+    if (i != 0) {
+      CHECK_EQ(v8_str("escape value"), values[i]);
+    } else {
+      CHECK(values[i].IsEmpty());
+    }
+  }
+}