Test service as minimum repro for sharing memory handle

services/test/service_impl.cc

+// Copyright 2016 The Chromium 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 "services/test/service_impl.h"
+
+#include "mojo/public/cpp/system/platform_handle.h"
+#include "services/service_manager/public/cpp/service_info.h"
+
+namespace test {
+
+ServiceImpl::ServiceImpl() {
+  registry_.AddInterface<mojom::Service>(this);
+}
+
+ServiceImpl::~ServiceImpl() = default;
+
+void ServiceImpl::OnBindInterface(
+    const service_manager::ServiceInfo& source_info,
+    const std::string& interface_name,
+    mojo::ScopedMessagePipeHandle interface_pipe) {
+  registry_.BindInterface(source_info.identity, interface_name,
+                          std::move(interface_pipe));
+}
+
+void ServiceImpl::Create(const service_manager::Identity& remote_identity,
+                         mojom::ServiceRequest request) {
+  service_bindings_.AddBinding(this, std::move(request));
+}
+
+void ServiceImpl::ShareBufferToTestReceiver(mojom::ReceiverPtr receiver) {
+  test_receiver_ = std::move(receiver);
+  const size_t kMemorySize = 1024;
+  bool create_memory_success =
+      shared_memory_.CreateAndMapAnonymous(kMemorySize);
+  CHECK(create_memory_success);
+  mojo::ScopedSharedBufferHandle handle = mojo::WrapSharedMemoryHandle(
+      base::SharedMemory::DuplicateHandle(shared_memory_.handle()), kMemorySize,
+      false /* read_only */);
+  test_receiver_->ReceiveBufferHandle(std::move(handle));
+}
+
+}  // namespace test