Added android.app.cts.DialogTest#testTouchEvent cts test to knownfailures. DO NOT MERGE

Bug: 15455341
Change-Id: Ied255855454fe54f8a4748c594d737ba80f8362f
diff --git a/tests/expectations/knownfailures.txt b/tests/expectations/knownfailures.txt
index 9f81170..a8f2a73 100644
--- a/tests/expectations/knownfailures.txt
+++ b/tests/expectations/knownfailures.txt
@@ -45,6 +45,10 @@
   bug: 14657953
 },
 {
+  name: "android.app.cts.DialogTest#testTouchEvent",
+  bug: 15455341
+},
+{
   name: "android.database.sqlite.cts.SQLiteQueryBuilderTest#testSetProjectionMap",
   bug: 12475524
 },