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Make GlProgram an outer class. · 7507da51
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
hschlueter committed
