Renaming InvalidationTrackerTest to have Kotlin extension.

Test: Existing tests
Bug: 233855234
Relnote: Renaming InvalidationTrackerTest to have Kotlin extension.
Change-Id: I30603e2196608335abb134f8957d393d8d3f1c61
diff --git a/room/room-runtime/src/main/java/androidx/room/InvalidationTracker.kt b/room/room-runtime/src/main/java/androidx/room/InvalidationTracker.kt
index a31e893..020aedb 100644
--- a/room/room-runtime/src/main/java/androidx/room/InvalidationTracker.kt
+++ b/room/room-runtime/src/main/java/androidx/room/InvalidationTracker.kt
@@ -93,6 +93,7 @@
     @GuardedBy("observerMap")
     @RestrictTo(RestrictTo.Scope.LIBRARY)
     @JvmField
+    @VisibleForTesting
     protected val observerMap = SafeIterableMap<Observer, ObserverWrapper>()
 
     private var multiInstanceInvalidationClient: MultiInstanceInvalidationClient? = null
diff --git a/room/room-runtime/src/test/java/androidx/room/InvalidationTrackerTest.java b/room/room-runtime/src/test/java/androidx/room/InvalidationTrackerTest.kt
similarity index 99%
rename from room/room-runtime/src/test/java/androidx/room/InvalidationTrackerTest.java
rename to room/room-runtime/src/test/java/androidx/room/InvalidationTrackerTest.kt
index 2729620..8a9293b 100644
--- a/room/room-runtime/src/test/java/androidx/room/InvalidationTrackerTest.java
+++ b/room/room-runtime/src/test/java/androidx/room/InvalidationTrackerTest.kt
@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2017 The Android Open Source Project
+ * Copyright 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.