EglConfigGLSurfaceView: fix incorrect count passed to glDrawArrays

glDrawArrays was attempting to draw 9 vertices even though mFloatBuffer
only held 3 vertices which could lead to a crash when attempting to access
memory past the end of mFloatBuffer.

Change-Id: I76a0d17a4bcad0e5fac2cc73ea4100b02624953c
1 file changed