According to the ANGLE_multiview spec Draw* commands should generate
an INVALID_OPERATION error if there is an active transform feedback
object and the number of views in the active draw framebuffer is greater
than 1. The patch addresses this by extending the base draw call
validation.

BUG=angleproject:2062
TEST=angle_end2end_tests

Change-Id: I67221cb2cfee6febae8d97697b234aeffff313de
Reviewed-on: https://chromium-review.googlesource.com/589268
Commit-Queue: Martin Radev <mradev@nvidia.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>