Add Mac10.12 builders to list of supported Blink builders.

third_party/WebKit/Tools/Scripts/webkitpy/common/config/builders.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/common/config/builders.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/common/config/builders.py b/third_party/WebKit/Tools/Scripts/webkitpy/common/config/builders.py
index d0d55fa1c0393829e62514c156fb7cc4055efa89..19c3b6deb59fdc2ba84dd0c711feaebfcdeef03f 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/common/config/builders.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/common/config/builders.py
@@ -67,6 +67,10 @@ BUILDERS = {
         "port_name": "mac-retina",
         "specifiers": ['Retina', 'Release']
     },
+    "WebKit Mac10.12": {
+        "port_name": "mac-mac10.12",
+        "specifiers": ['Mac10.12', 'Release']
+    },
     "WebKit Android (Nexus4)": {
         "port_name": "android",
         "specifiers": ['Android', 'Release']
@@ -96,6 +100,11 @@ BUILDERS = {
         "specifiers": ['Retina', 'Release'],
         "is_try_builder": True,
     },
+    "mac10.12_blink_rel": {
+        "port_name": "mac-mac10.12",
+        "specifiers": ['Mac10.12', 'Release'],
+        "is_try_builder": True,
+    },
     "win7_blink_rel": {
         "port_name": "win-win7",
         "specifiers": ['Win7', 'Release'],