Add multisample to foveation app

[jorgeag-google]

Makes the foveation app able to use multisample foveation

This change was missing from the previous PR #493

[apazylbe]

Did you run with validation layers? I assume it creates correct multisampled images for render target?

[jorgeag-google]

I run it on device with both methods and saw the foveation pattern working
I run a debug build (on Android) and then look in the logcat and saw no errors.
So I assume it has the validation layers, but not sure

[apazylbe]

We don't enable validation layers by default on debug Android builds,

bigwheels/include/ppx/application.h

Line 146 in 5ea74e5

#if !defined(NDEBUG) && !defined(PPX_ANDROID)

just cause they take additional steps to set up.
Overall LGTM, I would just double check with validation layers just in case.

[jorgeag-google]

So, there is a validation error:

VUID-VkSwapchainCreateInfoKHR-compositeAlpha-01280(ERROR / SPEC): msgNum: -1341842926 - Validation Error:
[ VUID-VkSwapchainCreateInfoKHR-compositeAlpha-01280 ] | MessageID = 0xb0051a12 | vkCreateSwapchainKHR(): pCreateInfo->compositeAlpha is not supported, support values are: VK_COMPOSITE_ALPHA_INHERIT_BIT_KHR%s                                                                                                    . The Vulkan spec states: compositeAlpha must be one of the bits present in the supportedCompositeAlpha member of the VkSurfaceCapabilitiesKHR structure returned by vkGetPhysicalDeviceSurfaceCapabilitiesKHR for the surface (https://www.khronos.org/registry/vulkan/specs/1.3-extensions/html/vkspec.html#VUID-VkSwapchainCreateInfoKHR-compositeAlpha-01280)

But there is common to all Android capable applications on the device rather than just the foveation app