Reland "Generate stubs for ANGLE_shader_pixel_local_storage" This is a reland of commit 8208e8a234d05b413d79e7a93b6a428adea41b33 In Take 2 we omit the GLenum groups PixelLocalLoadOpANGLE and PixelLocalInternalFormatANGLE. We can add these back once the extension is published and we can update Khronos's gl.xml, or else once we figure out how to make this work without updating the Khronos gl.xml. Original change's description: > Generate stubs for ANGLE_shader_pixel_local_storage > > Bug: angleproject:7279 > Change-Id: I41548ad35c236b67372a12fecaa9a1b9c556d232 > Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3891972 > Commit-Queue: Chris Dalton <chris@rive.app> > Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Bug: angleproject:7279 Change-Id: I02f42c1cfc685ed95164744108e0c185d3a7fefb Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3900491 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Commit-Queue: Chris Dalton <chris@rive.app>