Cache glGetIntegerv(GL_MAX_VERTEX_ATTRIBS, int*).

BUG:27418143

If we don't, the chatter over the pipe will
kill framerate.

I believe this is OK for the emulator,
as the parameter is dependent on only the
GPU hardware.

Change-Id: I9bd74de6317316902bddf54b915ef509625cee52
3 files changed