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

device/usb/public/cpp/device_manager_delegate.h

Index: device/usb/public/cpp/device_manager_delegate.h
diff --git a/device/usb/public/cpp/device_manager_delegate.h b/device/usb/public/cpp/device_manager_delegate.h
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index 0000000000000000000000000000000000000000..306be181a07ff833623d97525210b7092c63008c
--- /dev/null
+++ b/device/usb/public/cpp/device_manager_delegate.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_PUBLIC_CPP_DEVICE_MANAGER_DELEGATE_H_
+#define DEVICE_USB_PUBLIC_CPP_DEVICE_MANAGER_DELEGATE_H_
+
+#include "device/usb/public/interfaces/device.mojom.h"
+
+namespace device {
+namespace usb {
+
+// Interface used by DeviceManager instances to delegate certain decisions and
+// behaviors out to their embedder.
+class DeviceManagerDelegate {
+ public:
+  virtual ~DeviceManagerDelegate() {}
+
+  // Determines whether a given device should be accessible to clients of the
+  // DeviceManager instance.
+  virtual bool IsDeviceAllowed(const DeviceInfo& info) = 0;
+};
+
+}  // namespace usb
+}  // namespace device
+
+#endif  // DEVICE_USB_PUBLIC_CPP_DEVICE_MANAGER_DELEGATE_H_