Add ChromeShellTestApk and other chrome/ test stuff

build/config/android/rules.gni

Index: build/config/android/rules.gni
diff --git a/build/config/android/rules.gni b/build/config/android/rules.gni
index 0c9dbf221110b302beff2126a42e432fea570621..344202c71d156f076e821fb47842d5508fcb292c 100644
--- a/build/config/android/rules.gni
+++ b/build/config/android/rules.gni
@@ -1203,3 +1203,12 @@ template("proto_java_library") {
     ]
   }
 }
+
+# TODO(GYP): implement this.
+template("uiautomator_test") {
+  if (defined(invoker.testonly)) { testonly = invoker.testonly }
+  assert(target_name != "")
+  assert(invoker.deps != [] || true)
+  group(target_name) {
+  }
+}