athena: Expose the list of activities from the ActivityManager.

athena/activity/activity_manager_unittest.cc

Index: athena/activity/activity_manager_unittest.cc
diff --git a/athena/activity/activity_manager_unittest.cc b/athena/activity/activity_manager_unittest.cc
index 92e721d811c1358b7edc24f14579e7b8fd5d4907..561578e241cb3ac7a90fe4c7dc04ed2f7280ac4f 100644
--- a/athena/activity/activity_manager_unittest.cc
+++ b/athena/activity/activity_manager_unittest.cc
@@ -9,6 +9,7 @@
 #include "athena/test/base/athena_test_base.h"
 #include "athena/test/base/test_windows.h"
 #include "ui/aura/window.h"
+#include "ui/wm/core/window_util.h"
 
 namespace athena {
 
@@ -58,4 +59,25 @@ TEST_F(ActivityManagerTest, GetActivityForWindow) {
   EXPECT_EQ(nullptr, manager->GetActivityForWindow(window.get()));
 }
 
+TEST_F(ActivityManagerTest, ActivationBringsActivityToTop) {
+  ActivityManager* manager = ActivityManager::Get();
+  ActivityFactory* factory = ActivityFactory::Get();
+
+  Activity* activity1 =
+      factory->CreateWebActivity(nullptr, base::string16(), GURL());
+  Activity* activity2 =
+      factory->CreateWebActivity(nullptr, base::string16(), GURL());
+  activity1->GetWindow()->Show();
+  activity2->GetWindow()->Show();
+
+  ASSERT_EQ(2u, manager->GetActivityList().size());
+  EXPECT_EQ(activity2, manager->GetActivityList()[0]);
+  EXPECT_EQ(activity1, manager->GetActivityList()[1]);
+
+  wm::ActivateWindow(activity1->GetWindow());
+  ASSERT_EQ(2u, manager->GetActivityList().size());
+  EXPECT_EQ(activity1, manager->GetActivityList()[0]);
+  EXPECT_EQ(activity2, manager->GetActivityList()[1]);
+}
+
 }  // namespace athena