Add MacOS X 10.10 Yosemite support to GPUTestBotConfig.

gpu/config/gpu_test_config.h

Index: gpu/config/gpu_test_config.h
diff --git a/gpu/config/gpu_test_config.h b/gpu/config/gpu_test_config.h
index b83e027a2c83db6b4180a444f70eb6ed86d41433..8b184d3fe2e5e6fed818561d013939466e4d1fc9 100644
--- a/gpu/config/gpu_test_config.h
+++ b/gpu/config/gpu_test_config.h
@@ -30,11 +30,12 @@ class GPU_EXPORT GPUTestConfig {
     kOsMacLion = 1 << 6,
     kOsMacMountainLion = 1 << 7,
     kOsMacMavericks = 1 << 8,
+    kOsMacYosemite = 1 << 9,
     kOsMac = kOsMacLeopard | kOsMacSnowLeopard | kOsMacLion |
-             kOsMacMountainLion | kOsMacMavericks,
-    kOsLinux = 1 << 9,
-    kOsChromeOS = 1 << 10,
-    kOsAndroid = 1 << 11,
+             kOsMacMountainLion | kOsMacMavericks | kOsMacYosemite,
+    kOsLinux = 1 << 10,
+    kOsChromeOS = 1 << 11,
+    kOsAndroid = 1 << 12,
   };
 
   enum BuildType {