Fixing problem with the maximize mode where MultiProfile windows do not get properly handled

ash/wm/maximize_mode/maximize_mode_controller.h

Index: ash/wm/maximize_mode/maximize_mode_controller.h
diff --git a/ash/wm/maximize_mode/maximize_mode_controller.h b/ash/wm/maximize_mode/maximize_mode_controller.h
index 4614bef141959fcdce7c6347f79e8abad6a67841..bc4b2240c6bf7b9731915e3b98146187c9e5a595 100644
--- a/ash/wm/maximize_mode/maximize_mode_controller.h
+++ b/ash/wm/maximize_mode/maximize_mode_controller.h
@@ -33,6 +33,9 @@ class MaximizeModeControllerTest;
 class ScopedDisableInternalMouseAndKeyboard;
 class MaximizeModeWindowManager;
 class MaximizeModeWindowManagerTest;
+namespace test {
+class MultiUserWindowManagerChromeOSTest;
+}
 
 // MaximizeModeController listens to accelerometer events and automatically
 // enters and exits maximize mode when the lid is opened beyond the triggering
@@ -92,6 +95,12 @@ class ASH_EXPORT MaximizeModeController
   // Test if the MaximizeModeWindowManager is enabled or not.
   bool IsMaximizeModeWindowManagerEnabled() const;
 
+  // Add a special window to the MaximizeModeWindowManager for tracking. This is
+  // only required for special windows which are handled by other window
+  // managers like the |MultiUserWindowManager|.
+  // If the maximize mode is not enabled no action will be performed.
+  void AddWindow(aura::Window* window);
+
   // TODO(jonross): move this into the destructor. Currently separated as
   // ShellOberver notifies of maximize mode ending, and the observers end up
   // attempting to access MaximizeModeController via the Shell. If done in
@@ -122,6 +131,7 @@ class ASH_EXPORT MaximizeModeController
  private:
   friend class MaximizeModeControllerTest;
   friend class MaximizeModeWindowManagerTest;
+  friend class test::MultiUserWindowManagerChromeOSTest;
 
   // Set the TickClock. This is only to be used by tests that need to
   // artificially and deterministically control the current time.