The test claimed to be drawing an hourglass followed by a square.  That
is:

    ----
     \/
     /\
    ----

followed by:

    ----
    |  |
    |  |
    ----

With the end result being:

    ----
    |\/|
    |/\|
    ----

However, in reality it was drawing two hour glasses with the same
result.  That is:

    ----
     \/
     /\
    ----

followed by:

    |\/|
    |/\|

Bug: angleproject:3361
Change-Id: I59a2930f78e6e448b6ccb2e5f70c73ff0f15a2ea
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1561650
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
Reviewed-by: Jamie Madill <jmadill@chromium.org>