Tests now passing:
  UnpackAlignmentTest.*
  UnpackRowLengthTest.*
  VertexAttributeCachingTest.*
  ViewportTest.*

These tests start to fail when run in the new batch layout
triggered by the new passing tests:

WebGLCompatibilityTest.
   DrawElementsBufferOutOfBoundsInIndexBuffer/
   DrawElementsBufferOutOfBoundsInVertexBuffer/
      ES2_Vulkan_SwiftShader

Bug: None
Change-Id: I4902f2eca864ca8b371d915c89487943af54bc89
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2987989
Commit-Queue: Gert Wollny <gert.wollny@collabora.com>
Reviewed-by: Cody Northrop <cnorthrop@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>