hschlueter 7507da51a0 Make GlProgram an outer class.
This change makes GlUtil.Program an outer class named GlProgram,
and also moves private static helpers as well as the inner classes
Attribute and Uniform which were only used by GlUtil.Program to
GlProgram. Other static utility methods remain in GlUtil.

No functional changes intended.

PiperOrigin-RevId: 426119299
2022-02-04 09:40:51 +00:00
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2022-02-04 09:40:51 +00:00