Merge "surfaceflinger: Only restart zygote if already running." am: 305af2eb09 am: bf8b6896a4 am: bfdfe9a52b

Original change: https://android-review.googlesource.com/c/platform/frameworks/native/+/1909853

Change-Id: I94963d51d3116df5a49054a6523f9f63ad23160b