Created min size for print preview dialog and modified to allow the

ui/wm/core/window_modality_controller.h

 // 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.
 
 #ifndef UI_WM_CORE_WINDOW_MODALITY_CONTROLLER_H_
 #define UI_WM_CORE_WINDOW_MODALITY_CONTROLLER_H_
 
 #include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "ui/aura/env_observer.h"
 #include "ui/aura/window_observer.h"
 #include "ui/events/event_handler.h"
 #include "ui/wm/wm_export.h"
 
 namespace ui {
 class EventTarget;
 class LocatedEvent;
 }
 
 namespace wm {
 
+// Key for native window proprety that indicates if the window (should be
+// ui::MODAL_TYPE_WINDOW) is top level with a transient parent and allows
+// events to be sent to the transient parent. Otherwise, window modal
+// transients will absorb all events sent to the transient parent.
+WM_EXPORT extern const char kAllowTransientParentEventsKey[];
+
 // Sets the modal parent for the child.
 WM_EXPORT void SetModalParent(aura::Window* child, aura::Window* parent);
 
 // Returns the modal transient child of |window|, or NULL if |window| does not
-// have any modal transient children.
+// have any modal transient children or if the children do not block the parent
+// window.
 WM_EXPORT aura::Window* GetModalTransient(aura::Window* window);
 
+// Returns the modal transient of |window| including window modal transients
+// that do not block the parent window.
+WM_EXPORT aura::Window* HasWindowModalTransient(aura::Window * window);
+
 // WindowModalityController is an event filter that consumes events sent to
 // windows that are the transient parents of window-modal windows. This filter
 // must be added to the CompoundEventFilter so that activation works properly.
 class WM_EXPORT WindowModalityController : public ui::EventHandler,
                                            public aura::EnvObserver,
                                            public aura::WindowObserver {
  public:
   explicit WindowModalityController(ui::EventTarget* event_target);
   ~WindowModalityController() override;
 
@@ skipping 21 matching lines @@
   std::vector<aura::Window*> windows_;
 
   ui::EventTarget* event_target_;
 
   DISALLOW_COPY_AND_ASSIGN(WindowModalityController);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_WINDOW_MODALITY_CONTROLLER_H_