Use named automation interface to control primary chrome on ChromeOS

chrome/test/functional/PYAUTO_TESTS

 # Copyright (c) 2010 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.
 #
 # This file lists the pyauto tests that run as a part of the functional test
 # suite.
 #
 # Tests can be enabled on a per-platform basis. Tests not listed here will
 # not be run.
 #
@@ skipping 182 matching lines @@
     ],
 
     'linux': [
     ],
 
     'chromeos': [
       # crosbug.com/6856
       '-translate.TranslateTest.testSessionRestore',
       '-translate.TranslateTest.testDownloadsNotTranslated',
     ],
-  }
+  },
+
+  # The PRIMARY_CHROME suite uses named automation interface to control
+  # primary chrome on ChromeOS.
+  'PRIMARY_CHROME': {
+    'all': [
+    ],
+
+    'win': [
+    ],
+
+    'mac': [
+    ],
+
+    'linux': [
+    ],
+
+    'chromeos': [
+      'chromeos_basic',
+    ],
+  },
+
 }