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

components/constrained_window/constrained_window_views.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 "components/constrained_window/constrained_window_views.h"
 
 #include <algorithm>
 
 #include "base/macros.h"
 #include "build/build_config.h"
@@ skipping 73 matching lines @@
     return;
 
   gfx::Point position = dialog_host->GetDialogPosition(size);
   views::Border* border = widget->non_client_view()->frame_view()->border();
   // Border may be null during widget initialization.
   if (border) {
     // Align the first row of pixels inside the border. This is the apparent
     // top of the dialog.
     position.set_y(position.y() - border->GetInsets().top());
   }
-
   if (widget->is_top_level()) {
-    position +=
+    if (!widget->IsModalTypeChild())
+      position +=
         views::Widget::GetWidgetForNativeView(dialog_host->GetHostView())->
             GetClientAreaBoundsInScreen().OffsetFromOrigin();
+
+    if (widget->IsModalTypeChild()) {

[Mike Wittman, 2016/07/26 17:27:35]

nit: if else

[rbpotter, 2016/07/26 21:48:19]

Acknowledged.

+      gfx::Rect bound =
+          views::Widget::GetWidgetForNativeView(dialog_host->GetHostView())->
+          GetClientAreaBoundsInScreen();
+      if (bound.width() - border->GetInsets().left() < size.width()) {
+        position.set_x(position.x() + (size.width()-bound.width())/2 +
+            border->GetInsets().left());
+      }
+    }
   }
-
   widget->SetBounds(gfx::Rect(position, size));
 }
 
 }  // namespace
 
 // static
 void SetConstrainedWindowViewsClient(
     std::unique_ptr<ConstrainedWindowViewsClient> new_client) {
   delete constrained_window_views_client;
   constrained_window_views_client = new_client.release();
 }
 
 void UpdateWebContentsModalDialogPosition(
     views::Widget* widget,
     web_modal::WebContentsModalDialogHost* dialog_host) {
   gfx::Size size = widget->GetRootView()->GetPreferredSize();
   gfx::Size max_size = dialog_host->GetMaximumDialogSize();
   // Enlarge the max size by the top border, as the dialog will be shifted
   // outside the area specified by the dialog host by this amount later.
   views::Border* border =
       widget->non_client_view()->frame_view()->border();
   // Border may be null during widget initialization.
   if (border)
     max_size.Enlarge(0, border->GetInsets().top());
-  size.SetToMin(max_size);
+  if (!widget->is_top_level())
+    size.SetToMin(max_size);
   UpdateModalDialogPosition(widget, dialog_host, size);
 }
 
 void UpdateWidgetModalDialogPosition(views::Widget* widget,
                                      web_modal::ModalDialogHost* dialog_host) {
   UpdateModalDialogPosition(widget, dialog_host,
                             widget->GetRootView()->GetPreferredSize());
 }
 
 views::Widget* ShowWebModalDialogViews(
@@ skipping 50 matching lines @@
     DCHECK_EQ(parent_view, host->GetHostView());
     ModalDialogHostObserver* dialog_host_observer =
         new WidgetModalDialogHostObserverViews(
             host, widget, kWidgetModalDialogHostObserverViewsKey);
     dialog_host_observer->OnPositionRequiresUpdate();
   }
   return widget;
 }
 
 }  // namespace constrained window