Undocks window first before side-snapping bounds

ash/wm/window_positioner.cc

Index: ash/wm/window_positioner.cc
diff --git a/ash/wm/window_positioner.cc b/ash/wm/window_positioner.cc
index f5b0da6662ef5342da59c97fd4bd0a1125581797..015d94eff5f38a7e5d16a393a8e9dde1beda30c6 100644
--- a/ash/wm/window_positioner.cc
+++ b/ash/wm/window_positioner.cc
@@ -324,10 +324,10 @@ void WindowPositioner::RearrangeVisibleWindowOnShow(
   if (single_window) {
     // When going from one to two windows both windows loose their
     // "positioned by user" flags.
-    added_window_state->set_bounds_changed_by_user(false);
+    added_window_state->SetBoundsChangedByUser(false);
     wm::WindowState* other_window_state =
         wm::GetWindowState(other_shown_window);
-    other_window_state->set_bounds_changed_by_user(false);
+    other_window_state->SetBoundsChangedByUser(false);
 
     if (WindowPositionCanBeManaged(other_shown_window)) {
       // Don't override pre auto managed bounds as the current bounds