Make isAppBad() lock-free

We trade off increased cost of (rare) mutations of the set of "bad" apps
in order to make the core lookup "is this specific app bad?" lock-free.
Locking discipline turned out to be a dominant cost in a very hot code
path within the running system, even uncontended.

Bug: 175339368
Bug: 163297662
Test: atest ActivityManagerServiceTest
Change-Id: I8803a177d46b01b86897f1e8d0966eb2452849fd
Merged-In: I8803a177d46b01b86897f1e8d0966eb2452849fd

core/java/com/android/internal/app/ProcessMap.java

@@ -22,7 +22,7 @@ import android.util.SparseArray;
 public class ProcessMap<E> {
     final ArrayMap<String, SparseArray<E>> mMap
             = new ArrayMap<String, SparseArray<E>>();
-    
+
     public E get(String name, int uid) {
         SparseArray<E> uids = mMap.get(name);
         if (uids == null) return null;
@@ -58,4 +58,6 @@ public class ProcessMap<E> {
     public int size() {
         return mMap.size();
     }
+
+    public void putAll(ProcessMap<E> other) { mMap.putAll(other.mMap); }
 }