Merge "swapchain: always return a signle image for shared presentation mode"...

Merge "swapchain: always return a signle image for shared presentation mode" into sc-qpr1-dev am: 1f251f13 am: 0a2b59b0 am: b9878c96

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/native/+/15686506

Change-Id: I6ce96c04f561d97059a57cf4d9e69d215e06a9fa