The ANGLE_shader_pixel_local_storage implementation makes internal use
of various other extensions. These extensions must be implicitly enabled
when ANGLE_shader_pixel_local_storage is in use. In this CL:
* Convert ANGLE_shader_pixel_local_storage and
ANGLE_shader_pixel_local_storage_coherent to requestable extensions.
* Implicitly enable the dependency extensions, including each other, at
the time either of these extensions is enabled.
Bug: angleproject:7279
Bug: chromium:1421437
Change-Id: I26acbda776fe7045ea99d4f1e3df445e7a5cfd7f
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/4306526
Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Kenneth Russell <kbr@chromium.org>
Commit-Queue: Chris Dalton <chris@rive.app>