Add GL_TEXTURE_BINDING_2D_MULTISAMPLE option to State.cpp to
query binding id of GL_TEXTURE_2D_MULTISAMPLE.

BUG=angleproject:1590
TEST=angle_deqp_gles31_tests.exe --deqp-case=dEQP-GLES31.functional.state_query.integer.texture_binding_2d_multisample_*

Change-Id: I86b24f00ac4e75eb0e2986f7cf2eb108aae14674
Reviewed-on: https://chromium-review.googlesource.com/561196
Commit-Queue: Geoff Lang <geofflang@chromium.org>
Reviewed-by: Yunchao He <yunchao.he@intel.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>