Check focusability in WindowFocusedFromInputEvent

ui/views/corewm/focus_controller.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/views/corewm/focus_controller.h"
 
 #include "base/auto_reset.h"
 #include "ui/aura/client/activation_change_observer.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/client/capture_client.h"
@@ skipping 318 matching lines @@
     SetActiveWindow(next_activatable);
     if (!(active_window_ && active_window_->Contains(focused_window_)))
       SetFocusedWindow(next_activatable);
   } else if (window->Contains(focused_window_)) {
     // Active window isn't changing, but focused window might be.
     SetFocusedWindow(rules_->GetFocusableWindow(next));
   }
 }
 
 void FocusController::WindowFocusedFromInputEvent(aura::Window* window) {
-  FocusWindow(window);
+  // Only focus |window| if it or any of its parents can be focused. Otherwise
+  // FocusWindow() will focus the topmost window, which may not be the
+  // currently focused one.
+  if (rules_->CanFocusWindow(GetToplevelWindow(window)))
+    FocusWindow(window);
 }
 
 }  // namespace corewm
 }  // namespace views