Add 'flog' service implementation.

services/flog/flog_service_impl.h

+// 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.
+
+#ifndef MOJO_SERVICES_FLOG_FLOG_SERVICE_IMPL_H_
+#define MOJO_SERVICES_FLOG_FLOG_SERVICE_IMPL_H_
+
+#include <map>
+#include <memory>
+
+#include "mojo/common/binding_set.h"
+#include "mojo/services/flog/interfaces/flog.mojom.h"
+#include "services/flog/flog_directory.h"
+#include "services/util/cpp/factory_service_base.h"
+#include "services/util/cpp/incident.h"
+
+namespace mojo {
+namespace flog {
+
+// FlogService implementation.
+class FlogServiceImpl : public util::FactoryServiceBase, public FlogService {
+ public:
+  FlogServiceImpl();
+
+  ~FlogServiceImpl() override;
+
+  // ApplicationImplBase overrides.
+  void OnInitialize() override;
+
+  bool OnAcceptConnection(ServiceProviderImpl* service_provider_impl) override;
+
+  // FlogService implementation.
+  void CreateLogger(InterfaceRequest<FlogLogger> logger,
+                    const String& label) override;
+
+  void GetLogDescriptions(const GetLogDescriptionsCallback& callback) override;
+
+  void CreateReader(InterfaceRequest<FlogReader> reader,
+                    uint32_t log_id) override;
+
+ private:
+  Incident ready_;
+  BindingSet<FlogService> bindings_;
+  uint32_t last_allocated_log_id_ = 0;
+  std::unique_ptr<std::map<uint32_t, std::string>> log_labels_by_id_;
+  std::shared_ptr<FlogDirectory> directory_;
+};
+
+}  // namespace flog
+}  // namespace mojo
+
+#endif  // MOJO_SERVICES_FLOG_FLOG_SERVICE_IMPL_H_