Use interface associations to check function permissions.

device/usb/mojo/mock_permission_provider.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_MOCK_PERMISSION_PROVIDER_H_

[juncai, 2016/04/02 00:16:04]

nit: add "_MOJO" substring to the include guard:
DEVICE_USB_MOJO_MOCK_PERMISSION_PROVIDER_H_

[Reilly Grant (use Gerrit), 2016/04/02 01:35:45]

Done.

+#define DEVICE_USB_MOCK_PERMISSION_PROVIDER_H_
+
+#include <stdint.h>
+
+#include "base/memory/weak_ptr.h"
+#include "device/usb/mojo/permission_provider.h"
+#include "testing/gmock/include/gmock/gmock.h"
+
+namespace device {
+namespace usb {
+
+class MockPermissionProvider : public PermissionProvider {
+ public:
+  MockPermissionProvider();
+  ~MockPermissionProvider() override;
+
+  base::WeakPtr<PermissionProvider> GetWeakPtr();
+  MOCK_CONST_METHOD1(HasDevicePermission, bool(const DeviceInfo& device_info));
+  MOCK_CONST_METHOD2(HasConfigurationPermission,
+                     bool(uint8_t requested_configuration,
+                          const DeviceInfo& device_info));
+  MOCK_CONST_METHOD3(HasFunctionPermission,
+                     bool(uint8_t requested_function,
+                          uint8_t configuration_value,
+                          const DeviceInfo& device_info));
+
+ private:
+  base::WeakPtrFactory<PermissionProvider> weak_factory_;
+};
+
+}  // namespace usb
+}  // namespace device
+
+#endif  // DEVICE_USB_MOCK_PERMISSION_PROVIDER_H_