Add webkitpy platform support for Mac 10.10 Yosemite.

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

Index: Tools/Scripts/webkitpy/layout_tests/port/base.py
diff --git a/Tools/Scripts/webkitpy/layout_tests/port/base.py b/Tools/Scripts/webkitpy/layout_tests/port/base.py
index d0ed032209a07e99f659860423d87d901f17ab7b..5d7eaaf45e3aea2351d2c9291d59a9acd4d179ff 100644
--- a/Tools/Scripts/webkitpy/layout_tests/port/base.py
+++ b/Tools/Scripts/webkitpy/layout_tests/port/base.py
@@ -101,6 +101,7 @@ class Port(object):
 
         ('mountainlion', 'x86'),
         ('mavericks', 'x86'),
+        ('yosemite', 'x86'),
         ('xp', 'x86'),
         ('win7', 'x86'),
         ('lucid', 'x86'),
@@ -111,13 +112,13 @@ class Port(object):
         )
 
     ALL_BASELINE_VARIANTS = [
-        'mac-mavericks', 'mac-mountainlion', 'mac-retina', 'mac-lion', 'mac-snowleopard',
+        'mac-yosemite', 'mac-mavericks', 'mac-mountainlion', 'mac-retina', 'mac-lion', 'mac-snowleopard',

[Dirk Pranke, 2015/06/18 17:23:03]

nit: same comments about retina ordering.

         'win-win7', 'win-xp',
         'linux-x86_64', 'linux-x86',
     ]
 
     CONFIGURATION_SPECIFIER_MACROS = {
-        'mac': ['snowleopard', 'lion', 'retina', 'mountainlion', 'mavericks'],
+        'mac': ['snowleopard', 'lion', 'retina', 'mountainlion', 'mavericks', 'yosemite'],
         'win': ['xp', 'win7'],
         'linux': ['lucid'],
         'android': ['icecreamsandwich'],