Add APIs for improved MTS testing

Bug: 147884233
Test: build
Test: atest luni/src/test/java/libcore/libcore/timezone/TimeZoneDataFilesTest.java
Change-Id: Idab0ada3bd7da46a414016acbb9d6914f18ac154
diff --git a/non_openjdk_java_files.bp b/non_openjdk_java_files.bp
index afc8de8..0acee68 100644
--- a/non_openjdk_java_files.bp
+++ b/non_openjdk_java_files.bp
@@ -446,6 +446,7 @@
     srcs: [
         "luni/src/main/java/libcore/api/CorePlatformApi.java",
         "luni/src/main/java/libcore/api/IntraCoreApi.java",
+        "luni/src/main/java/libcore/timezone/TimeZoneDataFiles.java",
         "luni/src/main/java/libcore/timezone/TzDataSetVersion.java",
     ],
 }