ES31: Add std430 support for OpenGL backend

BUG=angleproject:1920
TEST=angle_unittests

Change-Id: Ie8e171abec053c2c5dca93d6e79db534f74520e7
Reviewed-on: https://chromium-review.googlesource.com/737532
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/compiler/translator/CollectVariables.cpp b/src/compiler/translator/CollectVariables.cpp
index 692cf73..51a4145 100644
--- a/src/compiler/translator/CollectVariables.cpp
+++ b/src/compiler/translator/CollectVariables.cpp
@@ -29,7 +29,9 @@
         case EbsShared:
             return BLOCKLAYOUT_SHARED;
         case EbsStd140:
-            return BLOCKLAYOUT_STANDARD;
+            return BLOCKLAYOUT_STD140;
+        case EbsStd430:
+            return BLOCKLAYOUT_STD430;
         default:
             UNREACHABLE();
             return BLOCKLAYOUT_SHARED;