Add MacOS X 10.10 Yosemite support to GPUTestBotConfig.

gpu/config/gpu_test_config.cc

Index: gpu/config/gpu_test_config.cc
diff --git a/gpu/config/gpu_test_config.cc b/gpu/config/gpu_test_config.cc
index 2328bd663ec19839c5138d03e715dca55d46b9fc..c062c4da73c040fe95b4d1cf88e8ff2e94f43db0 100644
--- a/gpu/config/gpu_test_config.cc
+++ b/gpu/config/gpu_test_config.cc
@@ -57,6 +57,8 @@ GPUTestConfig::OS GetCurrentOS() {
         return GPUTestConfig::kOsMacMountainLion;
       case 9:
         return GPUTestConfig::kOsMacMavericks;
+      case 10:
+        return GPUTestConfig::kOsMacYosemite;
     }
   }
 #elif defined(OS_ANDROID)
@@ -172,6 +174,7 @@ bool GPUTestBotConfig::IsValid() const {
     case kOsMacLion:
     case kOsMacMountainLion:
     case kOsMacMavericks:
+    case kOsMacYosemite:
     case kOsLinux:
     case kOsChromeOS:
     case kOsAndroid: