Convert flicker tests to kotlin

This will allow us to replace the Consumer/Runnable based assertions for lambdas, making the code easier to read and maintain.

Test: atest FlickerTests
Change-Id: I3c6a6bd8cd18f7eae0d5daa4510d30a8020d3f6b
diff --git a/tests/FlickerTests/Android.bp b/tests/FlickerTests/Android.bp
index baff952..070dacb 100644
--- a/tests/FlickerTests/Android.bp
+++ b/tests/FlickerTests/Android.bp
@@ -16,7 +16,7 @@
 
 android_test {
     name: "FlickerTests",
-    srcs: ["src/**/*.java"],
+    srcs: ["src/**/*.java", "src/**/*.kt"],
     manifest: "AndroidManifest.xml",
     test_config: "AndroidTest.xml",
     platform_apis: true,