Fixed exception handling in Realm.create().

src/api.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/api.h"
 
 #include <string.h>  // For memcpy, strlen.
 #ifdef V8_USE_ADDRESS_SANITIZER
 #include <sanitizer/asan_interface.h>
 #endif  // V8_USE_ADDRESS_SANITIZER
@@ skipping 5566 matching lines @@
     v8::ExtensionConfiguration* extensions,
     v8::Handle<ObjectTemplate> global_template,
     v8::Handle<Value> global_object) {
   i::Isolate* isolate = reinterpret_cast<i::Isolate*>(external_isolate);
   LOG_API(isolate, "Context::New");
   i::HandleScope scope(isolate);
   ExtensionConfiguration no_extensions;
   if (extensions == NULL) extensions = &no_extensions;
   i::Handle<i::Context> env =
       CreateEnvironment(isolate, extensions, global_template, global_object);
-  if (env.is_null()) return Local<Context>();
+  if (env.is_null()) {
+    if (isolate->has_pending_exception()) {
+      isolate->OptionalRescheduleException(true);
+    }
+    return Local<Context>();
+  }
   return Utils::ToLocal(scope.CloseAndEscape(env));
 }
 
 
 void v8::Context::SetSecurityToken(Handle<Value> token) {
   i::Handle<i::Context> env = Utils::OpenHandle(this);
   i::Handle<i::Object> token_handle = Utils::OpenHandle(*token);
   env->set_security_token(*token_handle);
 }
 
@@ skipping 2798 matching lines @@
   Address callback_address =
       reinterpret_cast<Address>(reinterpret_cast<intptr_t>(callback));
   VMState<EXTERNAL> state(isolate);
   ExternalCallbackScope call_scope(isolate, callback_address);
   callback(info);
 }
 
 
 }  // namespace internal
 }  // namespace v8