Reland: Build a basic Mojo service framework for device/usb

device/usb/device_manager_impl.h

Index: device/usb/device_manager_impl.h
diff --git a/device/usb/device_manager_impl.h b/device/usb/device_manager_impl.h
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index 0000000000000000000000000000000000000000..f9a8119ec6db970ffe16754c6e4e7ec092dccd53
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+++ b/device/usb/device_manager_impl.h
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+// Copyright 2015 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 DEVICE_USB_DEVICE_MANAGER_IMPL_H_
+#define DEVICE_USB_DEVICE_MANAGER_IMPL_H_
+
+#include <vector>
+
+#include "base/macros.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "device/usb/public/interfaces/device_manager.mojom.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/interface_request.h"
+#include "third_party/mojo/src/mojo/public/cpp/bindings/strong_binding.h"
+
+namespace device {
+
+class UsbDevice;
+class UsbDeviceFilter;
+
+namespace usb {
+
+class DeviceManagerDelegate;
+
+// Implementation of the public DeviceManager interface. Clients in the browser
+// can connect to this service via DeviceClient::ConnectToUSBDeviceManager.
+class DeviceManagerImpl : public DeviceManager {
+ public:
+  DeviceManagerImpl(mojo::InterfaceRequest<DeviceManager> request,
+                    scoped_ptr<DeviceManagerDelegate> delegate);
+  ~DeviceManagerImpl() override;
+
+ private:
+  // DeviceManager implementation:
+  void GetDevices(EnumerationOptionsPtr options,
+                  const GetDevicesCallback& callback) override;
+
+  // Callback to handle the async response from the underlying UsbService.
+  void OnGetDevices(const GetDevicesCallback& callback,
+                    const std::vector<UsbDeviceFilter>& filters,
+                    const std::vector<scoped_refptr<UsbDevice>>& devices);
+
+  mojo::StrongBinding<DeviceManager> binding_;
+
+  scoped_ptr<DeviceManagerDelegate> delegate_;
+
+  base::WeakPtrFactory<DeviceManagerImpl> weak_factory_;
+
+  DISALLOW_COPY_AND_ASSIGN(DeviceManagerImpl);
+};
+
+}  // namespace usb
+}  // namespace device
+
+#endif  // DEVICE_USB_DEVICE_MANAGER_IMPL_H_