docs/GL3.txt: add GLES 3.1 section

This just cherry-pick the extensions into a list for GLES 3.1

I'm not actually sure if this list if complete or correct, maybe someone
else can tell me what I missed, and I'm not 100% sure on multi_draw_indirect.

Reviewed-by: Matt Turner <mattst88@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/docs/GL3.txt b/docs/GL3.txt
index 52b0ce4..b9167fa3 100644
--- a/docs/GL3.txt
+++ b/docs/GL3.txt
@@ -182,7 +182,6 @@
   GL_ARB_texture_stencil8                              not started
   GL_ARB_vertex_type_10f_11f_11f_rev                   DONE (i965, nv50, nvc0, r600, radeonsi)
 
-
 GL 4.5, GLSL 4.50:
 
   GL_ARB_ES3_1_compatibility                           not started
@@ -198,6 +197,23 @@
   GL_KHR_robust_buffer_access_behavior                 not started
   GL_KHR_robustness                                    90% done (the ARB variant)
 
+These are the extensions cherry-picked to make GLES 3.1
+GLES3.1, GLSL ES 3.1
+  GL_ARB_arrays_of_arrays                              started (Timothy)
+  GL_ARB_compute_shader                                started (currently stalled)
+  GL_ARB_explicit_uniform_location                     DONE (all drivers that support GLSL)
+  GL_ARB_framebuffer_no_attachments                    not started
+  GL_ARB_program_interface_query                       not started
+  GL_ARB_shader_atomic_counters                        DONE (i965)
+  GL_ARB_shader_image_load_store                       in progress (curro)
+  GL_ARB_shader_storage_buffer_object                  not started
+  GL_ARB_separate_shader_objects                       DONE (all drivers)
+  GL_ARB_stencil_texturing                             DONE (i965/gen8+, nv50, nvc0, r600, radeonsi)
+  GL_ARB_vertex_attrib_binding                         DONE (all drivers)
+  GS5 Enhanced textureGather                           DONE (i965, nvc0, r600, radeonsi)
+  GS5 Packing/bitfield/conversion functions            DONE (i965, nvc0, r600)
+  GL_EXT_shader_integer_mix                            DONE (all drivers that support GLSL)
+
 
 More info about these features and the work involved can be found at
 http://dri.freedesktop.org/wiki/MissingFunctionality