Adds a \n between "Skipped" and message. am: 8b01e5b60b am: e184f2be4d am: bf87d554e7 am: d3461a678f

Original change: https://android-review.googlesource.com/c/platform/system/testing/gtest_extras/+/1363737

Change-Id: I0b4974fad1e64fd0c893b5aef71539cf91b4c8f3