Add arm/tegra2 CQ builders and major cleanup of dead code in chromeos_factory.

scripts/master/chromeos_revision_source.py

-# Copyright (c) 2010 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.
-
-"""Module for chromium-os-specific git source that dumps revisions."""
-
-import copy
-
-from buildbot.steps import source
-from buildbot.process import buildstep
-
-# Relative path to revision file for cbuildbot.
-PFQ_REVISION_FILE = 'chromite/buildbot/revisions.pfq'
-
-class GitRevisionDropper(source.Source):
-  """Drops a list of revisions from multiple git repositories."""
-
-  name = 'gitrevisiondropper'
-
-  def computeSourceRevision(self, changes):
-    """Creates a list of revision numbers.  Revision numbers coming from 
-    cros git hooks are folder_name:revision.
-
-    This is a hook method provided by the parent source.Source class and
-    default implementation in source.Source returns None. Return value of this
-    method is be used to set 'revision' argument value for startVC() method."""
-    revision_list = ''
-    if not changes:
-      return None
-
-    def GrabRevision(change):
-      """Handle revision == None or any invalid value."""
-      return '%s@%s' % (change.repository, change.revision)
-
-    for change in changes:
-      revision = GrabRevision(change)
-      revision_list = '%s %s' % (revision_list, revision)
-    revision_list = revision_list.strip()
-    return revision_list
-
-  def startVC(self, branch, revision, patch):
-    """Drops a source stamp for other steps"""
-    args = copy.copy(self.args)
-    args['command'] = 'echo "%s" > %s' % (revision, PFQ_REVISION_FILE)
-    # Shell is defined by buildbot.slave.SlaveShellCommand.
-    cmd = buildstep.LoggedRemoteCommand("shell", args)
-    self.startCommand(cmd, [])