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

chrome/browser/ui/webui/constrained_web_dialog_ui.h

 // 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.
 
 #ifndef CHROME_BROWSER_UI_WEBUI_CONSTRAINED_WEB_DIALOG_UI_H_
 #define CHROME_BROWSER_UI_WEBUI_CONSTRAINED_WEB_DIALOG_UI_H_
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "content/public/browser/web_ui_controller.h"
@@ skipping 73 matching lines @@
 
  private:
   // JS Message Handler
   void OnDialogCloseMessage(const base::ListValue* args);
 
   DISALLOW_COPY_AND_ASSIGN(ConstrainedWebDialogUI);
 };
 
 // Create and show a constrained HTML dialog. The actual object that gets
 // created is a ConstrainedWebDialogDelegate, which later triggers construction
-// of a ConstrainedWebDialogUI object.
+// of a ConstrainedWebDialogUI object. The returned object deletes itself when
+// the dialog closes.
 // |browser_context| is used to construct the constrained HTML dialog's
 //                   WebContents.
 // |delegate| controls the behavior of the dialog.
 // |overshadowed| is the tab being overshadowed by the dialog.
 ConstrainedWebDialogDelegate* ShowConstrainedWebDialog(
     content::BrowserContext* browser_context,
     ui::WebDialogDelegate* delegate,
     content::WebContents* overshadowed);
 
+// Create and show a constrained HTML dialog that, for ChromeOS, is not bound
+// to the limits of the parent window. For all other operating systems, which
+// do not support child windows that are not clipped to the parent window,
+// the function has the same behavior as ShowConstrainedWebDialog. The actual
+// object that gets created is a ConstrainedWebDialogDelegate, which later
+// triggers construction of a ConstrainedWebDialogUI object. The returned
+// object deletes itself when the dialog closes.
+// |browser_context| is used to construct the constrained HTML dialog's
+//                   WebContents.
+// |delegate| controls the behavior of the dialog.
+// |overshadowed| is the tab being overshadowed by the dialog.
+ConstrainedWebDialogDelegate* ShowTopLevelConstrainedWebDialog(
+    content::BrowserContext* browser_context,
+    ui::WebDialogDelegate* delegate,
+    content::WebContents* web_contents);
+
 // Create and show a constrained HTML dialog with auto-resize enabled. The
 // dialog is shown automatically after document load has completed to avoid UI
-// jankiness.
+// jankiness. The returned object deletes itself when the dialog closes.
 // |browser_context| is used to construct the dialog's WebContents.
 // |delegate| controls the behavior of the dialog.
 // |overshadowed| is the tab being overshadowed by the dialog.
 // |min_size| is the minimum size of the dialog.
 // |max_size| is the maximum size of the dialog.
 ConstrainedWebDialogDelegate* ShowConstrainedWebDialogWithAutoResize(
     content::BrowserContext* browser_context,
     ui::WebDialogDelegate* delegate,
     content::WebContents* overshadowed,
     const gfx::Size& min_size,
     const gfx::Size& max_size);
 
 #endif  // CHROME_BROWSER_UI_WEBUI_CONSTRAINED_WEB_DIALOG_UI_H_