sustained perf: Create GLES2.0 context instead of GLES3.0

Some devices may not support OpenGL ES 3.0, create GLES2.0
context to do the test.

Change-Id: I52d4bbd49a873958e548e6c3d918e65598febdaf
Signed-off-by: Richard Liu <xuegang.liu@nxp.com>
1 file changed