collect windows from mru_list in workspace_controller.

ash/app_list/app_list_presenter_delegate_unittest.cc

Index: ash/app_list/app_list_presenter_delegate_unittest.cc
diff --git a/ash/app_list/app_list_presenter_delegate_unittest.cc b/ash/app_list/app_list_presenter_delegate_unittest.cc
index 10c6b451e352758ea1c30255dc1b89bbd859bd0c..499c8d419b0d440f83f70b7e4efef00a1dc2b89f 100644
--- a/ash/app_list/app_list_presenter_delegate_unittest.cc
+++ b/ash/app_list/app_list_presenter_delegate_unittest.cc
@@ -700,7 +700,7 @@ TEST_F(AppListPresenterDelegateTest,
   EXPECT_TRUE(app_list::features::IsFullscreenAppListEnabled());
   EXPECT_FALSE(GetPrimaryShelf()->IsHorizontalAlignment());
   EXPECT_EQ(GetPrimaryShelf()->shelf_layout_manager()->GetShelfBackgroundType(),
-            SHELF_BACKGROUND_DEFAULT);

[oshima, 2017/07/13 04:41:32]

This should stay right?

[Muyuan, 2017/07/13 18:46:01]

It should be OVERLAP per UX requirement. The test itself is not setup properly..
I put down a todo and created a bug:
https://bugs.chromium.org/p/chromium/issues/detail?id=742461 to track the issue
separately.

+            SHELF_BACKGROUND_OVERLAP);
 }
 
 // Tests that the half app list closes if the user taps outside its bounds.