Make the minimized home card not overlap activities on Athena

athena/test/athena_test_helper.cc

Index: athena/test/athena_test_helper.cc
diff --git a/athena/test/athena_test_helper.cc b/athena/test/athena_test_helper.cc
index f8916a174426c1385d5f6cda593e337286879442..6a9121aa54f431a421b9d7423574aefd112788e0 100644
--- a/athena/test/athena_test_helper.cc
+++ b/athena/test/athena_test_helper.cc
@@ -8,6 +8,7 @@
 #include "athena/screen/public/screen_manager.h"
 #include "athena/test/sample_activity_factory.h"
 #include "athena/test/test_app_model_builder.h"
+#include "athena/test/test_screen_manager_delegate.h"
 #include "base/command_line.h"
 #include "base/message_loop/message_loop.h"
 #include "base/run_loop.h"
@@ -70,6 +71,8 @@ void AthenaTestHelper::SetUp(ui::ContextFactory* context_factory) {
   test_screen_.reset(aura::TestScreen::Create(host_size));
   gfx::Screen::SetScreenInstance(gfx::SCREEN_TYPE_NATIVE, test_screen_.get());
   host_.reset(test_screen_->CreateHostForPrimaryDisplay());
+  screen_manager_delegate_.reset(
+      new TestScreenManagerDelegate(test_screen_.get()));
 
   input_method_filter_.reset(new ::wm::InputMethodEventFilter(
       root_window()->GetHost()->GetAcceleratedWidget()));
@@ -87,7 +90,7 @@ void AthenaTestHelper::SetUp(ui::ContextFactory* context_factory) {
   // Ensure width != height so tests won't confuse them.
   host()->SetBounds(gfx::Rect(host_size));
 
-  athena::StartAthenaEnv(root_window());
+  athena::StartAthenaEnv(root_window(), screen_manager_delegate_.get());
   athena::StartAthenaSession(new SampleActivityFactory(),
                              new TestAppModelBuilder());
 }