Merge "Create 600dpi assets" am: 3ee9e4da84 am: 5a0c94d571 am: 25a11ca6c9

Original change: https://android-review.googlesource.com/c/platform/cts/+/1662161

Change-Id: I10f26c94dc1c43e1bb1f5df3757fa2cd8b402b80