Merge "Prevent NPE while finishing activity" into rvc-dev am: 1dbee3e34b am: b9bd2da6f2

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/11788494

Change-Id: Ic2270be05f1acc7f2b24da4a421fd7865f7ec1e2

services/core/java/com/android/server/wm/ActivityTaskManagerService.java

@@ -1685,6 +1685,11 @@ public class ActivityTaskManagerService extends IActivityTaskManager.Stub {
         final NeededUriGrants resultGrants = collectGrants(resultData, r.resultTo);
 
         synchronized (mGlobalLock) {
+            // Sanity check in case activity was removed before entering global lock.
+            if (!r.isInHistory()) {
+                return true;
+            }
+
             // Keep track of the root activity of the task before we finish it
             final Task tr = r.getTask();
             final ActivityRecord rootR = tr.getRootActivity();