Build a basic Mojo service framework for device/usb

device/usb/public/cpp/device_manager_delegate.h

+// 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 "base/memory/ref_counted.h"
+#include "base/sequenced_task_runner.h"

[Reilly Grant (use Gerrit), 2015/05/27 21:00:53]

The two headers above are unnecessary.

[Ken Rockot(use gerrit already), 2015/05/27 22:35:03]

Good catch. They were used once upon a time, I swear!

+#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_