[Not For Review] Handle a view that that isn't a part of Widget tree focusManager handles

ui/views/focus/focus_manager.cc

Index: ui/views/focus/focus_manager.cc
diff --git a/ui/views/focus/focus_manager.cc b/ui/views/focus/focus_manager.cc
index b482dbe5128b40112ffb0572db11f019d819834f..3a045cb0cd729999245046b63cedb06cf321d4c1 100644
--- a/ui/views/focus/focus_manager.cc
+++ b/ui/views/focus/focus_manager.cc
@@ -301,9 +301,6 @@ void FocusManager::SetFocusedViewWithReason(
     View* view, FocusChangeReason reason) {
   if (focused_view_ == view)
     return;
-  // TODO(oshima|achuith): This is to diagnose crbug.com/687232.
-  // Change this to DCHECK once it's resolved.
-  CHECK(!view || ContainsView(view));
 
 #if !defined(OS_MACOSX)
   // TODO(warx): There are some AccessiblePaneViewTest failed on macosx.
@@ -327,15 +324,26 @@ void FocusManager::SetFocusedViewWithReason(
     observer.OnWillChangeFocus(focused_view_, view);
 
   View* old_focused_view = focused_view_;
-  focused_view_ = view;
+
+  bool focused_view_on_other_widget = view && !ContainsView(view);
+  if (focused_view_on_other_widget) {
+    focused_view_ = nullptr;
+  } else {
+    focused_view_ = view;
+  }
   if (old_focused_view)
     old_focused_view->Blur();
   // Also make |focused_view_| the stored focus view. This way the stored focus
   // view is remembered if focus changes are requested prior to a show or while
   // hidden.
-  SetStoredFocusView(focused_view_);
-  if (focused_view_)
+  if (!focused_view_on_other_widget) {
+    SetStoredFocusView(focused_view_);
+  }
+  if (focused_view_) {
     focused_view_->Focus();
+  } else if (view) {
+    view->RequestFocus();
+  }
 
   for (FocusChangeListener& observer : focus_change_listeners_)
     observer.OnDidChangeFocus(old_focused_view, focused_view_);