Enforce kotlin warnings as errors in InputTests

This will prevent us from having to look at kotlin warnings during
build.

Bug: 271455682
Test: atest InputTests
Change-Id: I834c97094534fcc3c2b103f0d5ddd07e405e4b24

tests/Input/Android.bp

@@ -13,6 +13,9 @@ android_test {
         "src/**/*.java",
         "src/**/*.kt",
     ],
+    kotlincflags: [
+        "-Werror",
+    ],
     platform_apis: true,
     certificate: "platform",
     static_libs: [

tests/Input/src/com/android/test/input/AnrTest.kt

@@ -73,7 +73,7 @@ class AnrTest {
         val contentResolver = instrumentation.targetContext.contentResolver
         hideErrorDialogs = Settings.Global.getInt(contentResolver, HIDE_ERROR_DIALOGS, 0)
         Settings.Global.putInt(contentResolver, HIDE_ERROR_DIALOGS, 0)
-        PACKAGE_NAME = UnresponsiveGestureMonitorActivity::class.java.getPackage().getName()
+        PACKAGE_NAME = UnresponsiveGestureMonitorActivity::class.java.getPackage()!!.getName()
     }
 
     @After

tests/Input/src/com/android/test/input/UnresponsiveGestureMonitorActivity.kt

@@ -45,7 +45,8 @@ class UnresponsiveGestureMonitorActivity : Activity() {
     private lateinit var mInputMonitor: InputMonitor
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
-        mInputMonitor = InputManager.getInstance().monitorGestureInput(MONITOR_NAME, displayId)
+        val inputManager = getSystemService(InputManager::class.java)
+        mInputMonitor = inputManager.monitorGestureInput(MONITOR_NAME, displayId)
         mInputEventReceiver = UnresponsiveReceiver(
                 mInputMonitor.getInputChannel(), Looper.myLooper())
     }