[Telemetry] Add recognition for OS X 10.10 Yosemite

BUG=409919

Review URL: https://codereview.chromium.org/533443003

Cr-Commit-Position: refs/heads/master@{#293017}

tools/telemetry/telemetry/core/platform/mac_platform_backend.py

@@ -143,6 +143,8 @@ class MacPlatformBackend(posix_platform_backend.PosixPlatformBackend):
       return platform_backend.MOUNTAINLION
     if os_version.startswith('13.'):
       return platform_backend.MAVERICKS
+    if os_version.startswith('14.'):
+      return platform_backend.YOSEMITE
 
     raise NotImplementedError('Unknown mac version %s.' % os_version)
 

tools/telemetry/telemetry/core/platform/mac_platform_backend_unittest.py

@@ -12,10 +12,13 @@ from telemetry.core.platform import platform_backend
 
 class MacPlatformBackendTest(unittest.TestCase):
   def testVersionCamparison(self):
+    self.assertGreater(platform_backend.YOSEMITE,
+                       platform_backend.MAVERICKS)
     self.assertGreater(platform_backend.MAVERICKS,
                        platform_backend.SNOWLEOPARD)
     self.assertGreater(platform_backend.LION,
                        platform_backend.LEOPARD)
+    self.assertEqual(platform_backend.YOSEMITE, 'yosemite')
     self.assertEqual(platform_backend.MAVERICKS, 'mavericks')
     self.assertEqual('%s2' % platform_backend.MAVERICKS, 'mavericks2')
     self.assertEqual(''.join([platform_backend.MAVERICKS, '2']),

tools/telemetry/telemetry/core/platform/platform_backend.py

@@ -34,11 +34,12 @@ VISTA =        OSVersion('vista',         6.0)
 WIN7 =         OSVersion('win7',          6.1)
 WIN8 =         OSVersion('win8',          6.2)
 
-LEOPARD =      OSVersion('leopard',      10.5)
-SNOWLEOPARD =  OSVersion('snowleopard',  10.6)
-LION =         OSVersion('lion',         10.7)
-MOUNTAINLION = OSVersion('mountainlion', 10.8)
-MAVERICKS =    OSVersion('mavericks',    10.9)
+LEOPARD =      OSVersion('leopard',      105)
+SNOWLEOPARD =  OSVersion('snowleopard',  106)
+LION =         OSVersion('lion',         107)
+MOUNTAINLION = OSVersion('mountainlion', 108)
+MAVERICKS =    OSVersion('mavericks',    109)
+YOSEMITE =     OSVersion('yosemite',     1010)
 
 
 class PlatformBackend(object):