Enable NativeActivity based Android tests.

testing/test.gni

Index: testing/test.gni
diff --git a/testing/test.gni b/testing/test.gni
index c01306c644880a3b574cda10aec1445640e51451..1caad5dc9d02ee7b10af667720f4644747f5c86e 100644
--- a/testing/test.gni
+++ b/testing/test.gni
@@ -63,6 +63,7 @@ template("_gen_isolate") {
 # set.
 # Variable:
 #   use_raw_android_executable: Use executable() rather than android_apk().
+#   use_native_activity: Test implements ANativeActivity_onCreate().
 template("test") {
   if (is_android) {
     import("//build/config/android/config.gni")
@@ -153,6 +154,8 @@ template("test") {
         }
       }
     } else {
+      _use_native_activity =
+          defined(invoker.use_native_activity) && invoker.use_native_activity

[agrieve, 2016/05/19 00:42:51]

nit: it's a bit less code to just add "use_native_activity" to the list of
forwarded variables in unittest_apk() below.

[ynovikov, 2016/05/20 02:38:10]

Done.

       _library_target = "_${target_name}__library"
       _apk_target = "${target_name}_apk"
       _apk_specific_vars = [
@@ -180,6 +183,7 @@ template("test") {
       }
       unittest_apk(_apk_target) {
         forward_variables_from(invoker, _apk_specific_vars + [ "deps" ])
+        use_native_activity = _use_native_activity
         unittests_dep = ":$_library_target"
         apk_name = invoker.target_name
         if (defined(invoker.output_name)) {