add GlobalMaxPooling2D
add GlobalMaxPooling2D

PiperOrigin-RevId: 334866648

google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research,google-research/google-research