Adding new extension GL_OVR_multiview

GL_OVR_multiview functions exactly the same as GL_OVR_multiview2.
All GL_OVR_multiview2 tests now also repeat the same test using GL_OVR_multiview

Bug: angleproject:3341
Change-Id: I7e5294fb6bbf7692535174a15da6a42e1b5fc4e2
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1575904
Commit-Queue: Rafael Cintron <rafael.cintron@microsoft.com>
Reviewed-by: Geoff Lang <geofflang@chromium.org>
diff --git a/src/libANGLE/validationES2.cpp b/src/libANGLE/validationES2.cpp
index c4e05e1..248a511 100644
--- a/src/libANGLE/validationES2.cpp
+++ b/src/libANGLE/validationES2.cpp
@@ -2689,7 +2689,7 @@
         }
     }
 
-    if (extensions.multiview2 && extensions.disjointTimerQuery)
+    if ((extensions.multiview || extensions.multiview2) && extensions.disjointTimerQuery)
     {
         const State &state       = context->getState();
         Framebuffer *framebuffer = state.getDrawFramebuffer();