Add deps builder mapping for yosemite port.

Tools/Scripts/webkitpy/layout_tests/port/builders_unittest.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 22 matching lines @@
 
 class BuildersTest(unittest.TestCase):
     def test_path_from_name(self):
         tests = {
             'test': 'test',
             'Mac 10.6 (dbg)(1)': 'Mac_10_6__dbg__1_',
             '(.) ': '____',
         }
         for name, expected in tests.items():
             self.assertEqual(expected, builders.builder_path_from_name(name))
+
+    def test_deps_builder_mappings(self):
+        for port_name in builders.all_port_names():
+            if port_name != 'android':
+                self.assertIsNotNone(builders.deps_builder_name_for_port_name(port_name))