Enable ES 3.1 generation in glgen.py, and regenerate everything to add
support for that as well as these new extensions in the registry:
- EXT_copy_image
- EXT_draw_buffers_indexed
- EXT_geometry_shader
- EXT_gpu_shader5
- EXT_primitive_bounding_box
- EXT_shader_implicit_conversions
- EXT_shader_io_blocks
- EXT_tessellation_shader
- EXT_texture_border_clamp
- EXT_texture_buffer
- EXT_texture_cube_map_array
- EXT_texture_view
Bug: 15028495
Change-Id: I3f45a7ef5367c70e54ce6b36a8c030ae11033434
fca1b54031