Bring an activity to the front upon click & drag

Clicking on the control area of a window should bring it to
the top and set the focus since it might be used as a drag
operation which would move / resize it.

Bug: 23179116
Change-Id: I672bfefa42dd85e962fe343aeb89167ce125f168
diff --git a/core/java/android/app/ActivityManagerNative.java b/core/java/android/app/ActivityManagerNative.java
index b003b31..1f1f356 100644
--- a/core/java/android/app/ActivityManagerNative.java
+++ b/core/java/android/app/ActivityManagerNative.java
@@ -827,10 +827,18 @@
             return true;
         }
 
+        case ACTIVATE_ACTIVITY_TRANSACTION: {
+            data.enforceInterface(IActivityManager.descriptor);
+            IBinder token = data.readStrongBinder();
+            activateActivity(token);
+            reply.writeNoException();
+            return true;
+        }
+
         case SET_FOCUSED_TASK_TRANSACTION: {
             data.enforceInterface(IActivityManager.descriptor);
             int taskId = data.readInt();
-            setFocusedStack(taskId);
+            setFocusedTask(taskId);
             reply.writeNoException();
             return true;
         }
@@ -3623,6 +3631,18 @@
         return focusedStackId;
     }
     @Override
+    public void activateActivity(IBinder token) throws RemoteException
+    {
+        Parcel data = Parcel.obtain();
+        Parcel reply = Parcel.obtain();
+        data.writeInterfaceToken(IActivityManager.descriptor);
+        data.writeStrongBinder(token);
+        mRemote.transact(ACTIVATE_ACTIVITY_TRANSACTION, data, reply, 0);
+        reply.readException();
+        data.recycle();
+        reply.recycle();
+    }
+    @Override
     public void setFocusedTask(int taskId) throws RemoteException
     {
         Parcel data = Parcel.obtain();