Add support from restoring recent's backup.

Bug: 15986349
Change-Id: I899f81d317fcd5277a75db7ba50ecca14112df26
diff --git a/core/java/android/app/ActivityManagerNative.java b/core/java/android/app/ActivityManagerNative.java
index 06a26ec..e8d08b8 100644
--- a/core/java/android/app/ActivityManagerNative.java
+++ b/core/java/android/app/ActivityManagerNative.java
@@ -2363,6 +2363,13 @@
             reply.writeNoException();
             return true;
         }
+
+        case SYSTEM_BACKUP_RESTORED: {
+            data.enforceInterface(IActivityManager.descriptor);
+            systemBackupRestored();
+            reply.writeNoException();
+            return true;
+        }
         }
 
         return super.onTransact(code, data, reply, flags);
@@ -5458,5 +5465,16 @@
         reply.recycle();
     }
 
+    @Override
+    public void systemBackupRestored() throws RemoteException {
+        Parcel data = Parcel.obtain();
+        Parcel reply = Parcel.obtain();
+        data.writeInterfaceToken(IActivityManager.descriptor);
+        mRemote.transact(SYSTEM_BACKUP_RESTORED, data, reply, 0);
+        reply.readException();
+        data.recycle();
+        reply.recycle();
+    }
+
     private IBinder mRemote;
 }