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

components/constrained_window/native_web_contents_modal_dialog_manager_views.h

 // Copyright 2016 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 COMPONENTS_CONSTRAINED_WINDOW_NATIVE_WEB_CONTENTS_MODAL_DIALOG_MANAGER_VIEWS_H_
 #define COMPONENTS_CONSTRAINED_WINDOW_NATIVE_WEB_CONTENTS_MODAL_DIALOG_MANAGER_VIEWS_H_
 
 #include <set>
 
 #include "base/macros.h"
 #include "components/web_modal/modal_dialog_host.h"
 #include "components/web_modal/single_web_contents_dialog_manager.h"
+#if defined(USE_AURA)
+#include "ui/aura/window_observer.h"
+#endif
+#include "ui/base/accelerators/accelerator.h"
 #include "ui/gfx/native_widget_types.h"
 #include "ui/views/widget/widget_observer.h"
 
 namespace views {
 class Widget;
 }
 
 namespace constrained_window {
 
 // Class for parenting a tab-modal views dialog off of a views browser.
+#if defined(USE_AURA)
 class NativeWebContentsModalDialogManagerViews
     : public web_modal::SingleWebContentsDialogManager,
       public web_modal::ModalDialogHostObserver,
-      public views::WidgetObserver {
+      public views::WidgetObserver,
+      public aura::WindowObserver {
  public:
   NativeWebContentsModalDialogManagerViews(
       gfx::NativeWindow dialog,
-      web_modal::SingleWebContentsDialogManagerDelegate* native_delegate);
+      web_modal::SingleWebContentsDialogManagerDelegate* native_delegate,
+      bool is_toplevel, ui::AcceleratorTarget* target);
 
   ~NativeWebContentsModalDialogManagerViews() override;
 
   // Sets up this object to manage the |dialog_|. Registers for closing events
-  // in order to notify the delegate.
-  void ManageDialog();
+  // in order to notify the delegate. If |is_toplevel| is true, the dialog will
+  // be set up as a top level dialog (peer of the host's native window), with
+  // the host as its transient parent. However, unlike most window modal
+  // dialogs, it will not block all events to its transient parent.
+  void ManageDialog(bool is_toplevel);
 
   // web_modal::SingleWebContentsDialogManager:
   void Show() override;
   void Hide() override;
   void Close() override;
   void Focus() override;
   void Pulse() override;
 
   // web_modal::ModalDialogHostObserver:
   void OnPositionRequiresUpdate() override;
   void OnHostDestroying() override;
 
   // views::WidgetObserver:
 
   // NOTE(wittman): OnWidgetClosing is overriden to ensure that, when the widget
   // is explicitly closed, the destruction occurs within the same call
   // stack. This avoids event races that lead to non-deterministic destruction
   // ordering in e.g. the print preview dialog. OnWidgetDestroying is overridden
   // because OnWidgetClosing is *only* invoked on explicit close, not when the
   // widget is implicitly destroyed due to its parent being closed. This
   // situation occurs with app windows.  WidgetClosing removes the observer, so
   // only one of these two functions is ever invoked for a given widget.
   void OnWidgetClosing(views::Widget* widget) override;
   void OnWidgetDestroying(views::Widget* widget) override;
   void HostChanged(web_modal::WebContentsModalDialogHost* new_host) override;
   gfx::NativeWindow dialog() override;
 
+#if defined(USE_AURA)
+  // aura::WindowObserver
+  void OnWindowBoundsChanged(aura::Window* window,
+                             const gfx::Rect& old_bounds,
+                             const gfx::Rect& new_bounds) override;
+
+  void OnWindowRemovingFromRootWindow(aura::Window* window,
+                                      aura::Window* new_root) override;
+  void OnWindowDestroying(aura::Window* window) override;
+#endif
+
  protected:
   web_modal::SingleWebContentsDialogManagerDelegate* native_delegate() {
     return native_delegate_;
   }
 
   // By default just calls widget->Show() or Hide(), but allows a derived class
   // to override in order to hide an alternate way (e.g. if the default hide
   // would tear down attached dialogs too early).
   virtual void ShowWidget(views::Widget* widget);
   virtual void HideWidget(views::Widget* widget);
 
   static views::Widget* GetWidget(gfx::NativeWindow dialog);
 
+
  private:
   void WidgetClosing(views::Widget* widget);
+  void OnNonClippedPositionRequiresUpdate();
 
   web_modal::SingleWebContentsDialogManagerDelegate* native_delegate_;
   gfx::NativeWindow dialog_;
   web_modal::WebContentsModalDialogHost* host_;
   bool host_destroying_;
+  ui::AcceleratorTarget* target_;
   std::set<views::Widget*> observed_widgets_;
   std::set<views::Widget*> shown_widgets_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeWebContentsModalDialogManagerViews);
 };
+#else
+class NativeWebContentsModalDialogManagerViews
+    : public web_modal::SingleWebContentsDialogManager,
+      public web_modal::ModalDialogHostObserver,
+      public views::WidgetObserver {
+ public:
+  NativeWebContentsModalDialogManagerViews(
+      gfx::NativeWindow dialog,
+      web_modal::SingleWebContentsDialogManagerDelegate* native_delegate,
+      bool is_toplevel, ui::AcceleratorTarget* target);
 
+  ~NativeWebContentsModalDialogManagerViews() override;
+
+  // Sets up this object to manage the |dialog_|. Registers for closing events
+  // in order to notify the delegate. If |is_toplevel| is true, the dialog will
+  // be set up as a top level dialog (peer of the host's native window), with
+  // the host as its transient parent. However, unlike most window modal
+  // dialogs, it will not block all events to its transient parent.
+  void ManageDialog(bool is_toplevel);
+
+  // web_modal::SingleWebContentsDialogManager:
+  void Show() override;
+  void Hide() override;
+  void Close() override;
+  void Focus() override;
+  void Pulse() override;
+
+  // web_modal::ModalDialogHostObserver:
+  void OnPositionRequiresUpdate() override;
+  void OnHostDestroying() override;
+
+  // views::WidgetObserver:
+
+  // NOTE(wittman): OnWidgetClosing is overriden to ensure that, when the widget
+  // is explicitly closed, the destruction occurs within the same call
+  // stack. This avoids event races that lead to non-deterministic destruction
+  // ordering in e.g. the print preview dialog. OnWidgetDestroying is overridden
+  // because OnWidgetClosing is *only* invoked on explicit close, not when the
+  // widget is implicitly destroyed due to its parent being closed. This
+  // situation occurs with app windows.  WidgetClosing removes the observer, so
+  // only one of these two functions is ever invoked for a given widget.
+  void OnWidgetClosing(views::Widget* widget) override;
+  void OnWidgetDestroying(views::Widget* widget) override;
+  void HostChanged(web_modal::WebContentsModalDialogHost* new_host) override;
+  gfx::NativeWindow dialog() override;
+
+ protected:
+  web_modal::SingleWebContentsDialogManagerDelegate* native_delegate() {
+    return native_delegate_;
+  }
+
+  // By default just calls widget->Show() or Hide(), but allows a derived class
+  // to override in order to hide an alternate way (e.g. if the default hide
+  // would tear down attached dialogs too early).
+  virtual void ShowWidget(views::Widget* widget);
+  virtual void HideWidget(views::Widget* widget);
+
+  static views::Widget* GetWidget(gfx::NativeWindow dialog);
+
+
+ private:
+  void WidgetClosing(views::Widget* widget);
+  void OnNonClippedPositionRequiresUpdate();
+
+  web_modal::SingleWebContentsDialogManagerDelegate* native_delegate_;
+  gfx::NativeWindow dialog_;
+  web_modal::WebContentsModalDialogHost* host_;
+  bool host_destroying_;
+  ui::AcceleratorTarget* target_;
+  std::set<views::Widget*> observed_widgets_;
+  std::set<views::Widget*> shown_widgets_;
+
+  DISALLOW_COPY_AND_ASSIGN(NativeWebContentsModalDialogManagerViews);
+};
+#endif // USE_AURA
 }  // namespace constrained_window
 
 #endif  // COMPONENTS_CONSTRAINED_WINDOW_NATIVE_WEB_CONTENTS_MODAL_DIALOG_MANAGER_VIEWS_H_