Update PRESUBMIT files for first round of ng trybots

base/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.
 
 """Chromium presubmit script for src/base.
 
 See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
 for more details on the presubmit API built into gcl.
 """
 
@@ skipping 28 matching lines @@
 def CheckChangeOnUpload(input_api, output_api):
   results = []
   results.extend(_CommonChecks(input_api, output_api))
   return results
 
 
 def CheckChangeOnCommit(input_api, output_api):
   results = []
   results.extend(_CommonChecks(input_api, output_api))
   return results
-
-
-def GetPreferredTryMasters(project, change):

[Sergiy Byelozyorov, 2014/10/30 10:16:40]

Why is this (and others) being removed? Shouldn't these be used to new *_ng bots
instead.

[Paweł Hajdan Jr., 2014/10/30 10:19:10]

This is redundant since top-level presubmit file already has these bots.

[Sergiy Byelozyorov, 2014/10/30 10:38:24]

Is top-level PRESUBMIT executed when there is a more specific one?

[Paweł Hajdan Jr., 2014/10/30 10:40:49]

All of them get executed, please see
http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts

In other words, the top-level one is always executed.

[Sergiy Byelozyorov, 2014/10/30 10:52:57]

Acknowledged.

-  return {
-    'tryserver.chromium.linux': {
-      'linux_chromium_rel': set(['defaulttests']),
-    },
-    'tryserver.chromium.mac': {
-      'mac_chromium_rel': set(['defaulttests']),
-    },
-    'tryserver.chromium.win': {
-      'win_chromium_rel': set(['defaulttests']),
-    }
-  }