Add PDF compositor service

components/printing/service/pdf_compositor_service.h

+// 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.
+
+#ifndef COMPONENTS_PRINTING_SERVICE_PDF_COMPOSITOR_SERVICE_H_
+#define COMPONENTS_PRINTING_SERVICE_PDF_COMPOSITOR_SERVICE_H_
+
+#include <memory>
+#include <string>
+
+#include "base/callback.h"

[Lei Zhang, 2017/04/22 00:12:26]

Not used. Can we (only) IWYU?

[Wei Li, 2017/04/27 05:34:16]

Done.

+#include "base/macros.h"
+#include "base/memory/discardable_memory_allocator.h"
+#include "base/memory/discardable_shared_memory.h"
+#include "base/memory/weak_ptr.h"
+#include "base/single_thread_task_runner.h"
+#include "base/threading/thread.h"
+#include "components/discardable_memory/client/client_discardable_shared_memory_manager.h"
+#include "components/printing/service/public/interfaces/pdf_compositor.mojom.h"
+#include "services/service_manager/public/cpp/binder_registry.h"
+#include "services/service_manager/public/cpp/service.h"
+#include "services/service_manager/public/cpp/service_context_ref.h"
+
+namespace printing {
+
+class PdfCompositorService : public service_manager::Service {
+ public:
+  PdfCompositorService();
+  ~PdfCompositorService() override;
+
+  // Factory function for use as an embedded service.
+  static std::unique_ptr<service_manager::Service> Create(
+      const std::string& creator,
+      base::SingleThreadTaskRunner* runner);
+
+  // service_manager::Service:
+  void OnStart() override;
+  void OnBindInterface(const service_manager::ServiceInfo& source_info,
+                       const std::string& interface_name,
+                       mojo::ScopedMessagePipeHandle interface_pipe) override;
+
+ private:
+  static base::SingleThreadTaskRunner* io_task_runner_;

[Lei Zhang, 2017/04/22 00:12:26]

Why is this static and not per object?

[Wei Li, 2017/04/27 05:34:16]

removed

+
+  std::unique_ptr<discardable_memory::ClientDiscardableSharedMemoryManager>
+      discardable_shared_memory_manager_;
+  std::unique_ptr<service_manager::ServiceContextRefFactory> ref_factory_;
+  service_manager::BinderRegistry registry_;
+  base::WeakPtrFactory<PdfCompositorService> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(PdfCompositorService);
+};
+
+}  // namespace printing
+
+#endif  // COMPONENTS_PRINTING_SERVICE_PDF_COMPOSITOR_SERVICE_H_