Further limit the number of extra pids dumped as this is expensive. am: 3fab5c25

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21574163



Change-Id: Ia5cf2f0f6f8d13eae6273c4b292538259724b5ca
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>