[BackgroundSync] Formatting presubmit check for content/child/background_sync

Review URL: https://codereview.chromium.org/1127013007

Cr-Commit-Position: refs/heads/master@{#329679}

content/child/background_sync/PRESUBMIT.py

+# 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.
+
+"""Top-level presubmit script for src/content/child/background_sync/
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into depot_tools.
+"""
+
+def CheckChangeOnUpload(input_api, output_api):
+  return input_api.canned_checks.CheckPatchFormatted(input_api, output_api)