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

ui/aura/window_targeter.h

 // Copyright (c) 2013 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_AURA_WINDOW_TARGETER_H_
 #define UI_AURA_WINDOW_TARGETER_H_
 
 #include "base/macros.h"
 #include "ui/aura/aura_export.h"
 #include "ui/events/event_targeter.h"
 
 namespace ui {
 class KeyEvent;
 class LocatedEvent;
 }  // namespace ui
 
+namespace gfx {
+class Point;
+}  // namespace gfx
+
 namespace aura {
 
+// Key for native window proprety that indicates if the window should have
+// bounds independent of its modal parent. Only supported on ChromeOS.
+AURA_EXPORT extern const char kHasIndependentBoundsKey[];
+
 class Window;
 
 class AURA_EXPORT WindowTargeter : public ui::EventTargeter {
  public:
   WindowTargeter();
   ~WindowTargeter() override;
 
   // Returns true if |window| or one of its descendants can be a target of
   // |event|. This requires that |window| and its descendants are not
   // prohibited from accepting the event, and that the event is within an
@@ skipping 24 matching lines @@
   // parent's coordinate system.
   virtual bool EventLocationInsideBounds(Window* target,
                                          const ui::LocatedEvent& event) const;
 
   // ui::EventTargeter:
   ui::EventTarget* FindTargetForEvent(ui::EventTarget* root,
                                       ui::Event* event) override;
   ui::EventTarget* FindNextBestTarget(ui::EventTarget* previous_target,
                                       ui::Event* event) override;
 
+  // Returns true if |child|'s bounds can extend outside of |parent|'s bounds.
+  static bool ChildHasBoundsOutsideParent(Window* parent, Window *child);

[Lei Zhang, 2016/08/19 03:28:47]

'*' goes with the type, not the name.

[rbpotter, 2016/08/19 16:59:42]

Done.

+
+  // Returns whether the location of |event_point| is in an actionable region of
+  // |window| or any of its children. Does not assume that children are
+  // restricted to the bounds of their modal parent windows if the
+  // kHasIndependentBounds property is set. If |in_parent_coordinates| is true
+  // then |event_point| is in |window|'s parent's coordinate system, if false
+  // |event_point| is in |window|'s coordinate system.
+  bool HasIndependentChildWithEvent(Window* window,
+                                    const gfx::Point& event_point,
+                                    bool in_parent_coordinates);
+
  private:
   Window* FindTargetForKeyEvent(Window* root_window, const ui::KeyEvent& event);
   Window* FindTargetForNonKeyEvent(Window* root_window, ui::Event* event);
   Window* FindTargetInRootWindow(Window* root_window,
                                  const ui::LocatedEvent& event);
   Window* FindTargetForLocatedEventRecursively(Window* root_window,
                                                ui::LocatedEvent* event);
 
   DISALLOW_COPY_AND_ASSIGN(WindowTargeter);
 };
 
 }  // namespace aura
 
 #endif  // UI_AURA_WINDOW_TARGETER_H_