Make FunctionTemplate::HasInstance checks work with remote contexts.

test/unittests/api/remote-object-unittest.cc

 // Copyright 2017 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 "testing/gtest/include/gtest/gtest.h"
 
 #include "include/v8.h"
 #include "test/unittests/test-utils.h"
 
 namespace v8 {
@@ skipping 41 matching lines @@
       v8::FunctionTemplate::New(isolate(), Constructor);
   constructor_template->InstanceTemplate()->SetAccessCheckCallbackAndHandler(
       AccessCheck, v8::NamedPropertyHandlerConfiguration(NamedGetter),
       v8::IndexedPropertyHandlerConfiguration());
 
   v8::Local<v8::Object> remote_object =
       constructor_template->NewRemoteInstance().ToLocalChecked();
   EXPECT_TRUE(remote_object->CreationContext().IsEmpty());
 }
 
+TEST_F(RemoteObjectTest, RemoteContextHasInstance) {
+  v8::Local<v8::FunctionTemplate> parent_template =
+      v8::FunctionTemplate::New(isolate(), Constructor);
+
+  v8::Local<v8::FunctionTemplate> constructor_template =
+      v8::FunctionTemplate::New(isolate(), Constructor);
+  constructor_template->InstanceTemplate()->SetAccessCheckCallbackAndHandler(
+      AccessCheck, v8::NamedPropertyHandlerConfiguration(NamedGetter),
+      v8::IndexedPropertyHandlerConfiguration());
+  constructor_template->Inherit(parent_template);
+
+  v8::Local<v8::Object> remote_context =
+      v8::Context::NewRemoteContext(isolate(),
+                                    constructor_template->InstanceTemplate())
+          .ToLocalChecked();
+  EXPECT_TRUE(parent_template->HasInstance(remote_context));
+  EXPECT_TRUE(constructor_template->HasInstance(remote_context));
+}
+
 }  // namespace v8