Add a recipe to identify culprits for chromium compile failures.

scripts/slave/recipe_modules/findit/example.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.
+
+DEPS = [
+  'findit',
+  'path',
+  'platform',
+  'properties',
+]
+
+
+def RunSteps(api):
+  api.path['checkout'] = api.path.mkdtemp('fake_checkout')
+  revision = api.properties['revision']
+  repo_dir = api.properties.get('repo_dir')
+  api.findit.get_files_affected_by_revision(revision, repo_dir)
+
+
+def GenTests(api):
+  yield api.test('affected_files_without_repo_dir') + api.properties(
+      revision='r1',
+  )
+  yield api.test('affected_files_with_repo_dir') + api.properties(
+      revision='r1',
+      repo_dir='third_party/icu',
+  )
+  yield (
+      api.test('affected_files_on_win') +
+      api.platform.name('win') +
+      api.properties(
+          revision='r1',
+          repo_dir='third_party\\icu',
+      )
+  )