Use interface associations to check function permissions.

device/usb/mojo/mock_permission_provider.cc

+// 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.
+
+#include "device/usb/mojo/mock_permission_provider.h"
+
+#include <stddef.h>
+#include <utility>
+
+#include "device/usb/public/interfaces/device.mojom.h"
+
+using ::testing::Return;
+using ::testing::_;
+
+namespace device {
+namespace usb {
+
+MockPermissionProvider::MockPermissionProvider() : weak_factory_(this) {
+  ON_CALL(*this, HasDevicePermission(_)).WillByDefault(Return(true));
+  ON_CALL(*this, HasConfigurationPermission(_, _)).WillByDefault(Return(true));
+  ON_CALL(*this, HasFunctionPermission(_, _, _)).WillByDefault(Return(true));
+}
+
+MockPermissionProvider::~MockPermissionProvider() {}
+
+base::WeakPtr<PermissionProvider> MockPermissionProvider::GetWeakPtr() {
+  return weak_factory_.GetWeakPtr();
+}
+
+}  // namespace usb
+}  // namespace device