Enable more tests for the OpenGL backend.

Change-Id: I3fc9948498bd7c2b7c8e75f010196982de240c1b
Reviewed-on: https://chromium-review.googlesource.com/267461
Tested-by: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/tests/end2end_tests/UnpackAlignmentTest.cpp b/src/tests/end2end_tests/UnpackAlignmentTest.cpp
index 313da21..9e04fda 100644
--- a/src/tests/end2end_tests/UnpackAlignmentTest.cpp
+++ b/src/tests/end2end_tests/UnpackAlignmentTest.cpp
@@ -3,7 +3,7 @@
 #include <array>
 
 // Use this to select which configurations (e.g. which renderer, which GLES major version) these tests should be run against.
-ANGLE_TYPED_TEST_CASE(UnpackAlignmentTest, ES2_D3D9, ES2_D3D11);
+ANGLE_TYPED_TEST_CASE(UnpackAlignmentTest, ES2_D3D9, ES2_D3D11, ES2_OPENGL, ES3_OPENGL);
 
 template<typename T>
 class UnpackAlignmentTest : public ANGLETest