This is currently only supported for end2end tests (those which use
ANGLETestBase, excluding those that use WithNoFixture) and Vulkan.  Use
WithEmulatedPreoration(*_VULKAN(), degree) where degree is either 90,
180 or 270.

With emulated prerotation, the window dimensions are physically swapped
if 90 and 270 degrees, while the width and height is still reported as
requested by the test.  In the Vulkan backend, the width and height are
swapped after getting queried from the surface, and prerotation is
assumed.

Bug: angleproject:4901
Change-Id: I294436be4c7015d2a63463c4d61de7b67f38c95d
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2495544
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Ian Elliott <ianelliott@google.com>
Reviewed-by: Jamie Madill <jmadill@chromium.org>