Fix FLAG_ACTIVITY_CLEAR_TOP not working for aliased activities

bug: 26216591
Change-Id: I26528b7613bd8aa80fc7f4d6b64ea7bf639935d3
diff --git a/services/core/java/com/android/server/am/ActivityRecord.java b/services/core/java/com/android/server/am/ActivityRecord.java
index ed26e0c..4879cbfb 100755
--- a/services/core/java/com/android/server/am/ActivityRecord.java
+++ b/services/core/java/com/android/server/am/ActivityRecord.java
@@ -584,13 +584,16 @@
         haveState = true;
 
         if (aInfo != null) {
+            // If the class name in the intent doesn't match that of the target, this is
+            // probably an alias. We have to create a new ComponentName object to keep track
+            // of the real activity name, so that FLAG_ACTIVITY_CLEAR_TOP is handled properly.
             if (aInfo.targetActivity == null
-                    || aInfo.launchMode == ActivityInfo.LAUNCH_MULTIPLE
-                    || aInfo.launchMode == ActivityInfo.LAUNCH_SINGLE_TOP) {
+                    || (aInfo.targetActivity.equals(_intent.getComponent().getClassName())
+                    && (aInfo.launchMode == ActivityInfo.LAUNCH_MULTIPLE
+                    || aInfo.launchMode == ActivityInfo.LAUNCH_SINGLE_TOP))) {
                 realActivity = _intent.getComponent();
             } else {
-                realActivity = new ComponentName(aInfo.packageName,
-                        aInfo.targetActivity);
+                realActivity = new ComponentName(aInfo.packageName, aInfo.targetActivity);
             }
             taskAffinity = aInfo.taskAffinity;
             stateNotNeeded = (aInfo.flags&