Hide docked windows behind a flag

chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc

Index: chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
index 0ad10041b43391843787936645eed8dc795f2cf0..9d29b0e3f2ebd1f7b22f522ebfca41157cdd590f 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.cc
@@ -63,6 +63,7 @@
 
 #if defined(USE_ASH)
 #include "ash/aura/wm_window_aura.h"
+#include "ash/common/ash_switches.h"
 #include "ash/common/wm/root_window_finder.h"
 #include "ash/common/wm/window_state.h"
 #include "ash/shell.h"
@@ -2474,6 +2475,10 @@ void DetachToDockedWindowNextStep(
 // Drags from browser to separate window, docks that window and releases mouse.
 IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTest,
                        DetachToDockedWindowFromMaximizedWindow) {
+  // Enable docked windows for this test.
+  base::CommandLine::ForCurrentProcess()->AppendSwitch(
+      ash::switches::kAshEnableDockedWindows);
+
   // Maximize the initial browser window.
   browser()->window()->Maximize();
   ASSERT_TRUE(browser()->window()->IsMaximized());