[WebUI] Add some presubmit checks

chrome/browser/resources/PRESUBMIT.py

+# Copyright (c) 2012 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.
+
+"""Presubmit script for Chromium WebUI resources.
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into gcl/git cl, and see
+http://www.chromium.org/developers/web-development-style-guide for the rules
+we're checking against here.
+"""
+
+
+def CheckChangeOnUpload(input_api, output_api):
+  return _CommonChecks(input_api, output_api)
+
+
+def CheckChangeOnCommit(input_api, output_api):
+  return _CommonChecks(input_api, output_api)
+
+
+def _CommonChecks(input_api, output_api):
+  """Checks common to both upload and commit."""
+  results = []
+  resources = input_api.PresubmitLocalPath()
+
+  path = input_api.os_path
+  presubmit = path.join(resources, 'PRESUBMIT.py')
+  if presubmit in (f.AbsoluteLocalPath() for f in input_api.AffectedFiles()):
+    tests = [path.join(resources, 'test_presubmit.py')]
+    results.extend(
+        input_api.canned_checks.RunUnitTests(input_api, output_api, tests))
+
+  import sys
+  old_path = sys.path
+
+  try:
+    sys.path.insert(0, resources)
+    from web_dev_style import css_checker
+
+    # TODO(dbeam): Remove this filter eventually when ready.
+    def file_filter(affected_file):
+      dirs = (path.join(resources, 'ntp4'), path.join(resources, 'options2'))
+      f = affected_file.AbsoluteLocalPath()
+      return (f.startswith(dirs) and f.endswith(('.css', '.html', '.js')))
+
+    results.extend(css_checker.CSSChecker(input_api, output_api,
+                                          file_filter=file_filter).RunChecks())
+  finally:
+    sys.path = old_path
+
+  return results