Revert "Decouple gl_BaseVertex/gl_BaseInstance uniforms" This reverts commit 36bf1ebe5e9500704dd235254bd22a1f2bbd7059. Reason for revert: suspect causing flaky crashes Bug: angleproject:6763 Original change's description: > Decouple gl_BaseVertex/gl_BaseInstance uniforms > > These are builtin uniforms removed in > https://github.com/KhronosGroup/WebGL/pull/3278 > > Decouple them from the original ANGLE_base_vertex_base_instance > extension. > > Make a new ANGLE_base_vertex_base_instance_shader_builtin > extension for these builtin uniforms. > > Bug: angleproject:3402 > Change-Id: I77b93917976ce435db9c578c0ade37bff18a42b0 > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3290304 > Commit-Queue: Shrek Shao <shrekshao@google.com> > Reviewed-by: Geoff Lang <geofflang@chromium.org> > Reviewed-by: Kenneth Russell <kbr@chromium.org> Bug: angleproject:3402 Change-Id: I75830baa14cf4e7c53750fd14ff76501145b4823 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3315610 Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com> Reviewed-by: Yuly Novikov <ynovikov@chromium.org> Reviewed-by: Kenneth Russell <kbr@chromium.org> Commit-Queue: Shrek Shao <shrekshao@google.com>