Add AOSP header for Event.cpp and Event.h

Bug: 63905942
Bug: 66972624
Test: mm
Test: NeuralNetworksTest pass
Change-Id: I7bdeb3db0cbf4b44632bfcaed1c0b4fce6372f65
diff --git a/nn/runtime/Event.cpp b/nn/runtime/Event.cpp
index efaacb3..ea5b763 100644
--- a/nn/runtime/Event.cpp
+++ b/nn/runtime/Event.cpp
@@ -1,3 +1,19 @@
+/*
+ * Copyright (C) 2017 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 #include "Event.h"
 #include <android-base/logging.h>