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

components/constrained_window/constrained_window_views.cc

Index: components/constrained_window/constrained_window_views.cc
diff --git a/components/constrained_window/constrained_window_views.cc b/components/constrained_window/constrained_window_views.cc
index def5232fc9782603559d380c6499264f1c8ac6b5..2db4aaa694366e6461df3478e499c70b72bf3878 100644
--- a/components/constrained_window/constrained_window_views.cc
+++ b/components/constrained_window/constrained_window_views.cc
@@ -91,13 +91,22 @@ void UpdateModalDialogPosition(views::Widget* widget,
     // 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));
 }
 
@@ -122,7 +131,8 @@ void UpdateWebContentsModalDialogPosition(
   // 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);
 }