Automatically add a layout test running bots for api changes

R=machenbach@chromium.org

Change-Id: I48b6bda0bfb3c8aef117616015ee4225d4bdecfc
Reviewed-on: https://chromium-review.googlesource.com/517486
Commit-Queue: Jochen Eisinger <jochen@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#45562}

include/PRESUBMIT.py

+# Copyright 2017 the V8 project 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 //v8/include
+
+See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
+for more details about the presubmit API built into depot_tools.
+"""
+
+import re
+
+
+def _GetTryMasters(project, change):
+  return {
+    'master.tryserver.chromium.linux': {
+      'linux_blink_rel': [],
+     },
+  }
+
+
+def GetPreferredTryMasters(project, change):
+  # TODO(jochen): Using the value of _GetTryMasters() instead of an empty
+  # value here would cause 'git cl try' to include the site isolation trybots,
+  # which would be nice. But it has the side effect of replacing, rather than
+  # augmenting, the default set of try servers. Re-enable this when we figure
+  # out a way to augment the default set.
+  return {}
+
+
+def PostUploadHook(cl, change, output_api):
+  """git cl upload will call this hook after the issue is created/modified.
+
+  This hook adds extra try bots to the CL description in order to run layout
+  tests in addition to CQ try bots.
+  """
+  return output_api.EnsureCQIncludeTrybotsAreAdded(
+    cl,
+    [
+      'master.tryserver.chromium.linux:linux_blink_rel'
+    ],
+    'Automatically added layout test trybots to run tests on CQ.')