V2 app support step2 : Use NativeAppWindow for Activity's window.

athena/test/sample_activity_factory.cc

Index: athena/test/sample_activity_factory.cc
diff --git a/athena/test/sample_activity_factory.cc b/athena/test/sample_activity_factory.cc
index 92fa71a59fea0a13419f4cdb6de3fac9d4ef7d01..8fb0bd25175b09a4f9f9900d0acf7e13cb19d8e7 100644
--- a/athena/test/sample_activity_factory.cc
+++ b/athena/test/sample_activity_factory.cc
@@ -45,7 +45,9 @@ Activity* SampleActivityFactory::CreateAppActivity(
 }
 
 Activity* SampleActivityFactory::CreateAppActivity(
-    extensions::AppWindow* app_window) {
+    extensions::AppWindow* app_window,
+    views::WebView* web_view) {
+  DCHECK(!web_view);
   return new SampleActivity(
       kDefaultAppColor, kDefaultAppContentColor, base::UTF8ToUTF16("App"));
 }