Update Dr. Memory bot factories to fully handle a 3rd platform, MacOS.

masters/master.client.drmemory/master.cfg

 # -*- python -*-
 # ex: set syntax=python:
 
 # 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.
 
 # It has one job: define a dictionary named BuildmasterConfig. This
 # dictionary has a variety of keys to control different aspects of the
 # buildmaster. They are documented in docs/config.xhtml .
@@ skipping 134 matching lines @@
             'GYP_DEFINES': 'build_for_tool=drmemory component=shared_library',
         },
     },
 )
 
 c['builders'] = []
 
 # Bots that run on every commit: the pre-commit suite and the packager.
 for (os, os_versions) in MAINBOTS:
   c['builders'].append({'name': '%s-builder' % os,
-                        'factory': F_DRMPACK(os == "win")})
+                        'factory': F_DRMPACK(os)})
   for version in os_versions:
     c['builders'].append({'name': '%s-%s-drm' % (os, version),
-                          'factory': F_DRM(os == 'win')})
+                          'factory': F_DRM(os)})
 
 # Miscellaneous stability bots that run periodically.
 c['builders'].append({'name': 'win7-cr-builder',
                       'factory': f_win_cr_builder,
                       'auto_reboot': False,
                       })
 
 c['builders'].append({'name': 'win7-cr',
                       'factory': F_WIN_CR('win7-cr-builder'),
                       'auto_reboot': True,  # Kill stale processes
@@ skipping 85 matching lines @@
 
 ####### PROJECT IDENTITY
 
 # the 'projectName' string will be used to describe the project that this
 # buildbot is working on. For example, it is used as the title of the
 # waterfall HTML page. The 'projectURL' string will be used to provide a link
 # from buildbot HTML pages to your project's home page.
 
 c['projectName'] = ActiveMaster.project_name
 c['projectURL'] = config.Master.project_url