Fix GPUTestConfigTest.LoadCurrentConfig on macOS Sierra.

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 c936c8fce2b6094849a437d50024706bad574a81..10e88c1f2f77683d0c1b50acf60c8dde89defecb 100644
--- a/gpu/config/gpu_test_config.h
+++ b/gpu/config/gpu_test_config.h
@@ -32,13 +32,14 @@ class GPU_EXPORT GPUTestConfig {
     kOsMacMavericks = 1 << 8,
     kOsMacYosemite = 1 << 9,
     kOsMacElCapitan = 1 << 10,
+    kOsMacSierra = 1 << 11,
     kOsMac = kOsMacLeopard | kOsMacSnowLeopard | kOsMacLion |
              kOsMacMountainLion | kOsMacMavericks | kOsMacYosemite |
-             kOsMacElCapitan,
-    kOsLinux = 1 << 11,
-    kOsChromeOS = 1 << 12,
-    kOsAndroid = 1 << 13,
-    kOsWin10 = 1 << 14,
+             kOsMacElCapitan | kOsMacSierra,
+    kOsLinux = 1 << 12,
+    kOsChromeOS = 1 << 13,
+    kOsAndroid = 1 << 14,
+    kOsWin10 = 1 << 15,
     kOsWin = kOsWinXP | kOsWinVista | kOsWin7 | kOsWin8 | kOsWin10,
   };