BUG=angleproject:2270
TEST=angle_end2end_tests.ComputeShaderTest.DispatchComputeIndirect/ES3_1_D3D11

Change-Id: I29bd888ce1e7e3e09b5635699a36164cd97cd7de
Reviewed-on: https://chromium-review.googlesource.com/1209563Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Jie A Chen <jie.a.chen@intel.com>