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/Compiler.cpp b/src/compiler/translator/Compiler.cpp
index ea30da4..30b026f 100644
--- a/src/compiler/translator/Compiler.cpp
+++ b/src/compiler/translator/Compiler.cpp
@@ -1033,7 +1033,7 @@
     for (auto block : uniformBlocks)
     {
         if (!block.staticUse &&
-            (block.layout == sh::BLOCKLAYOUT_STANDARD || block.layout == sh::BLOCKLAYOUT_SHARED))
+            (block.layout == sh::BLOCKLAYOUT_STD140 || block.layout == sh::BLOCKLAYOUT_SHARED))
         {
             list.push_back(block);
         }