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

components/constrained_window/native_web_contents_modal_dialog_manager_views.cc

 // 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.
 
 #include "components/constrained_window/native_web_contents_modal_dialog_manager_views.h"
 
 #include <memory>
 
 #include "components/constrained_window/constrained_window_views.h"
 #include "components/web_modal/web_contents_modal_dialog_host.h"
 #include "components/web_modal/web_contents_modal_dialog_manager.h"
 #include "ui/gfx/geometry/point.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/views/border.h"
 #include "ui/views/widget/widget.h"
 #include "ui/views/widget/widget_delegate.h"
 #include "ui/views/window/dialog_delegate.h"
 #include "ui/views/window/non_client_view.h"
 
 #if defined(USE_AURA)
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/window.h"
+#include "ui/aura/window_targeter.h"
 #include "ui/wm/core/visibility_controller.h"
 #include "ui/wm/core/window_animations.h"
 #include "ui/wm/core/window_modality_controller.h"
 #endif
 
 using web_modal::SingleWebContentsDialogManager;
 using web_modal::SingleWebContentsDialogManagerDelegate;
 using web_modal::WebContentsModalDialogHost;
 using web_modal::ModalDialogHostObserver;
 
@@ skipping 38 matching lines @@
   gfx::NativeView parent = widget->GetNativeView()->parent();
   wm::SetChildWindowVisibilityChangesAnimated(parent);
   // No animations should get performed on the window since that will re-order
   // the window stack which will then cause many problems.
   if (parent && parent->parent()) {
     parent->parent()->SetProperty(aura::client::kAnimationsDisabledKey, true);
   }
 
   wm::SetModalParent(widget->GetNativeWindow(),
                      native_delegate_->GetWebContents()->GetNativeView());
+#if defined(OS_CHROMEOS)
+  if (native_delegate_->IsNonClipped(dialog())) {
+    widget->SetNativeWindowProperty(aura::kHasIndependentBoundsKey,
+                                    reinterpret_cast<void*>(true));
+  }
+#endif  // OS_CHROMEOS

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

// defined(OS_CHROMEOS)

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

Done.

 #endif

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

label this one too.  // defined(USE_AURA)

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

Done.

 }
 
 // SingleWebContentsDialogManager:
 
 void NativeWebContentsModalDialogManagerViews::Show() {
   // The host destroying means the dialogs will be destroyed in short order.
   // Avoid showing dialogs at this point as the necessary native window
   // services may not be present.
   if (host_destroying_)
     return;
@@ skipping 122 matching lines @@
 
 #if defined(USE_AURA)
   shown_widgets_.erase(widget);
 #endif
 
   // Will cause this object to be deleted.
   native_delegate_->WillClose(widget->GetNativeWindow());
 }
 
 }  // namespace constrained_window