Add missing copyright headers

Bug:5399509
Change-Id: Iba658e35cd0bf71a9320037ddb80257003f780c7
diff --git a/res/drawable/ic_plus.xml b/res/drawable/ic_plus.xml
index d5aa2e7..176b21a 100644
--- a/res/drawable/ic_plus.xml
+++ b/res/drawable/ic_plus.xml
@@ -1,4 +1,19 @@
 <?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2011 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.
+-->
+
 <selector xmlns:android="http://schemas.android.com/apk/res/android">
     <item android:state_enabled="false" android:drawable="@drawable/ic_plus_disabled_holo_dark" />
     <item android:drawable="@drawable/ic_plus_holo_dark" />