[GRC] UKM Support

services/resource_coordinator/service_callbacks_impl.cc

+// Copyright 2017 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/resource_coordinator/service_callbacks_impl.h"
+
+#include <utility>
+
+#include "base/memory/ptr_util.h"
+#include "components/ukm/public/mojo_ukm_recorder.h"
+#include "services/resource_coordinator/resource_coordinator_service.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
+
+namespace resource_coordinator {
+
+ServiceCallbacksImpl::ServiceCallbacksImpl(
+    service_manager::ServiceContextRefFactory* service_ref_factory,
+    ResourceCoordinatorService* resource_coordinator_service)
+    : service_ref_factory_(service_ref_factory),

[dcheng, 2017/06/23 16:10:35]

What's the reason we need to hang on to a pointer for this object?

[matthalp, 2017/06/23 16:36:28]

The service is ref-counted, so holding a reference to the service ensures that
it will stay alive while we are connected.

The service folks plan to encapsulate this eventually, but for now this his what
they recommend. oysteine@ can comment more if need be.

[dcheng, 2017/06/23 21:32:32]

Right, but isn't the ref created and held below on line 22? It doesn't seem like
the service_ref_factory pointer is useful after that.

[matthalp, 2017/06/23 21:56:13]

Yes, you are correct. Sorry for the confusion. I've removed the factory member.

+      resource_coordinator_service_(resource_coordinator_service) {
+  DCHECK(service_ref_factory);
+  service_ref_ = service_ref_factory_->CreateRef();
+}
+
+ServiceCallbacksImpl::~ServiceCallbacksImpl() = default;
+
+// static
+void ServiceCallbacksImpl::Create(
+    service_manager::ServiceContextRefFactory* service_ref_factory,
+    ResourceCoordinatorService* resource_coordinator_service,
+    const service_manager::BindSourceInfo& source_info,
+    resource_coordinator::mojom::ServiceCallbacksRequest request) {
+  mojo::MakeStrongBinding(
+      base::MakeUnique<ServiceCallbacksImpl>(service_ref_factory,
+                                             resource_coordinator_service),
+      std::move(request));
+}
+
+void ServiceCallbacksImpl::SetUkmRecorderInterface(
+    ukm::mojom::UkmRecorderInterfacePtr ukm_recorder_interface) {
+  resource_coordinator_service_->SetUkmRecorder(
+      base::MakeUnique<ukm::MojoUkmRecorder>(
+          std::move(ukm_recorder_interface)));
+}
+
+void ServiceCallbacksImpl::IsUkmRecorderInterfaceInitialized(
+    const IsUkmRecorderInterfaceInitializedCallback& callback) {
+  callback.Run(resource_coordinator_service_->ukm_recorder() != nullptr);
+}
+
+}  // namespace resource_coordinator