Add basic webview test for Instant Apps

This verifies that Instant Apps can properly load the code required to
start up a WebView.

Test: cts-tradefed run commandAndExit cts-dev -m
CtsAppSecurityHostTestCases -t
android.appsecurity.cts.EphemeralTest#testWebViewLoads

Change-Id: I3aa9c4252423a1a9daf539a4f7d9dd7013fa5a76
diff --git a/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp1/Android.mk b/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp1/Android.mk
index 672bcd4..b13432b 100644
--- a/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp1/Android.mk
+++ b/hostsidetests/appsecurity/test-apps/EphemeralTestApp/EphemeralApp1/Android.mk
@@ -17,11 +17,14 @@
 LOCAL_PATH := $(call my-dir)
 include $(CLEAR_VARS)
 
+LOCAL_JAVA_LIBRARIES := android.test.runner
 LOCAL_MODULE_TAGS := tests
 LOCAL_STATIC_JAVA_LIBRARIES := \
     cts-aia-util \
     android-support-test \
-    legacy-android-test
+    legacy-android-test \
+	ctsdeviceutillegacy \
+	ctstestrunner
 
 # tag this module as a cts test artifact
 LOCAL_COMPATIBILITY_SUITE := cts