depot_tools: add presubmit recipe module

BUG=584197

Review URL: https://codereview.chromium.org/1668803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@298588 0039d316-1c4b-4281-b951-d872f2087c98

recipe_modules/presubmit/__init__.py

+DEPS = [
+  'recipe_engine/python',
+]

recipe_modules/presubmit/api.py

+# Copyright 2016 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.
+
+from recipe_engine import recipe_api
+
+class PresubmitApi(recipe_api.RecipeApi):
+  def __call__(self, *args, **kwargs):
+    """Return a presubmit step."""
+    name = kwargs.pop('name', 'presubmit')
+    return self.m.python(
+        name, self.package_resource('presubmit_support.py'), list(args),
+        **kwargs)

recipe_modules/presubmit/example.expected/basic.json

+[
+  {
+    "cmd": [
+      "python",
+      "-u",
+      "RECIPE_PACKAGE[depot_tools]/presubmit_support.py"
+    ],
+    "cwd": "[SLAVE_BUILD]",
+    "name": "presubmit"
+  },
+  {
+    "name": "$result",
+    "recipe_result": null,
+    "status_code": 0
+  }
+]
\ No newline at end of file

recipe_modules/presubmit/example.py

+# Copyright 2016 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 = [
+  'presubmit',
+]
+
+
+def RunSteps(api):
+  api.presubmit()
+
+
+def GenTests(api):
+  yield api.test('basic')