According to the ANGLE_multiview spec indirect draw calls
must generate an INVALID_OPERATION error if the number of
views in the active draw framebuffer is greater than 1.
The patch addresses this by extending the indirect draw call
validation.

BUG=angleproject:2062
TEST=angle_end2end_tests

Change-Id: Ic30ef9a0eabba454aeea6176df1be8bd2ccd9783
Reviewed-on: https://chromium-review.googlesource.com/583027Reviewed-by: Geoff Lang <geofflang@chromium.org>
Commit-Queue: Martin Radev <mradev@nvidia.com>