Add deps builder mapping for yosemite port.

Tools/Scripts/webkitpy/layout_tests/port/builders.py

 # Copyright (C) 2011 Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 54 matching lines @@
     "linux-x86_64": "WebKit Linux (deps)",
     "win-xp": "WebKit XP (deps)",
     "win-win7": "WebKit XP (deps)",
     "mac-snowleopard": "WebKit Mac10.6 (deps)",
     # The following port names are mapped to 10.6 bot since we don't have bots
     # for these ports.
     "mac-lion": "WebKit Mac10.6 (deps)",
     "mac-mountainlion": "WebKit Mac10.6 (deps)",
     "mac-mavericks": "WebKit Mac10.6 (deps)",
     "mac-retina": "WebKit Mac10.6 (deps)",
+    "mac-yosemite": "WebKit Mac10.6 (deps)",
 }
 
 
 _ports_without_builders = [
 ]
 
 
 def builder_path_from_name(builder_name):
     return re.sub(r'[\s().]', '_', builder_name)
 
@@ skipping 28 matching lines @@
                 return builder_name
     return debug_builder_name
 
 
 def builder_path_for_port_name(port_name):
     builder_path_from_name(builder_name_for_port_name(port_name))
 
 
 def deps_builder_name_for_port_name(target_port_name):
     return _deps_builders.get(target_port_name, None)