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

components/constrained_window/constrained_window_views.h

Index: components/constrained_window/constrained_window_views.h
diff --git a/components/constrained_window/constrained_window_views.h b/components/constrained_window/constrained_window_views.h
index 972fca88ecfed68f9a1f3379216b8715b9db8442..181f157e437c39b59cb5e4c7538ace3902197926 100644
--- a/components/constrained_window/constrained_window_views.h
+++ b/components/constrained_window/constrained_window_views.h
@@ -7,6 +7,7 @@
 
 #include <memory>
 
+#include "ui/base/accelerators/accelerator.h"
 #include "ui/gfx/native_widget_types.h"
 
 namespace content {
@@ -51,7 +52,32 @@ content::WebContents* GetTopLevelWebContents(
 void ShowModalDialog(gfx::NativeWindow dialog,
                      content::WebContents* web_contents);
 
-// Calls CreateWebModalDialogViews, shows the dialog, and returns its widget.
+// Shows the dialog with a new SingleWebContentsDialogManager as a top level
+// dialog. The dialog is top level but will not block events to the dialog host
+// window. The dialog will be a transient child of the host window (Windows) or
+// of its parent (Linux/CrOS). The dialog will notify via WillClose() when it is
+// being destroyed. |target| will be attached to the host window as a handler
+// for accelerators. Note that unlike ShowTopLevelWebModalDialogViews, |dialog|
+// should already have a widget before this is called.
+void ShowTopLevelModalDialog(gfx::NativeWindow dialog,
+                             content::WebContents* web_contents,
+                             ui::AcceleratorTarget *target);
+
+// If |dialog| is child modal, calls CreateWebModalDialogViews, shows the
+// dialog, and returns its widget. If |dialog| is not child modal, create a
+// widget for |dialog| and show the dialog as a top level dialog without
+// blocking events to the top level dialog host window for |web_contents|. The
+// modal type will be the same as that of |dialog|. For Mac, which uses sheets,
+// this has the same behavior as ShowWebModalDialogViews. If non-null and
+// if |dialog| is not child modal, |target| will be attached to the host window
+// as a handler for accelerators.
+views::Widget* ShowWebModalDialogViews(
+    views::WidgetDelegate* dialog,
+    content::WebContents* initiator_web_contents,
+    ui::AcceleratorTarget* target);
+
+// Calls the function above with |target| = nullptr. |dialog| should be child
+// modal.
 views::Widget* ShowWebModalDialogViews(
     views::WidgetDelegate* dialog,
     content::WebContents* initiator_web_contents);