Previously, the incomplete framebuffer depth stencil attachment
test would run on ES2 if GL_OES_packed_depth_stencil were present.
This is insufficient since it uses the GL_DEPTH_STENCIL_ATTACHMENT
enum, which is not introduced in any extension prior to ES3. The
test has been disabled on ES2, regardless of extensions.
Bug: angleproject:4454
Test: angle_end2end_tests --gtest_filter=StateChangeTest.FramebufferIncompleteDepthStencilAttachment/*
Change-Id: Ic5a6a521e35b49c5d723b33f588fa608264d6390
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2090783
Commit-Queue: Mohan Maiya <m.maiya@samsung.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>
