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

chrome/browser/ui/webui/constrained_web_dialog_ui_browsertest.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 "base/callback.h"
 #include "base/location.h"
 #include "base/single_thread_task_runner.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/utf_string_conversions.h"
 #include "base/threading/thread_task_runner_handle.h"
@@ skipping 52 matching lines @@
 
 class AutoResizingTestWebDialogDelegate
     : public ui::test::TestWebDialogDelegate {
  public:
   explicit AutoResizingTestWebDialogDelegate(const GURL& url)
       : TestWebDialogDelegate(url) {}
   ~AutoResizingTestWebDialogDelegate() override {}
 
   // Dialog delegates for auto-resizing dialogs are expected not to set |size|.
   void GetDialogSize(gfx::Size* size) const override {}
+
+  ui::ModalType GetDialogModalType() const override {
+    return ui::MODAL_TYPE_CHILD;
+  }
 };
 
+class ChildModalTestWebDialogDelegate
+    : public ui::test::TestWebDialogDelegate {
+ public:
+  explicit ChildModalTestWebDialogDelegate(const GURL& url)
+      : TestWebDialogDelegate(url) {}
+  ~ChildModalTestWebDialogDelegate() override {}
+
+  // Dialog is child modal
+  ui::ModalType GetDialogModalType() const override {
+    return ui::MODAL_TYPE_CHILD;
+  }
+
+};
+
+
 }  // namespace
 
 class ConstrainedWebDialogBrowserTest : public InProcessBrowserTest {
  public:
   ConstrainedWebDialogBrowserTest() {}
 
   // Runs the current MessageLoop until |condition| is true or timeout.
   bool RunLoopUntil(const base::Callback<bool()>& condition) {
     const base::TimeTicks start_time = base::TimeTicks::Now();
     while (!condition.Run()) {
@@ skipping 15 matching lines @@
   bool IsShowingWebContentsModalDialog(WebContents* web_contents) const {
     WebContentsModalDialogManager* web_contents_modal_dialog_manager =
         WebContentsModalDialogManager::FromWebContents(web_contents);
     return web_contents_modal_dialog_manager->IsDialogActive();
   }
 };
 
 // Tests that opening/closing the constrained window won't crash it.
 IN_PROC_BROWSER_TEST_F(ConstrainedWebDialogBrowserTest, BasicTest) {
   // The delegate deletes itself.
-  WebDialogDelegate* delegate = new ui::test::TestWebDialogDelegate(
+  WebDialogDelegate* delegate = new ChildModalTestWebDialogDelegate(
       GURL(chrome::kChromeUIConstrainedHTMLTestURL));
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   ASSERT_TRUE(web_contents);
 
   ConstrainedWebDialogDelegate* dialog_delegate =
       ShowConstrainedWebDialog(browser()->profile(), delegate, web_contents);
   ASSERT_TRUE(dialog_delegate);
   EXPECT_TRUE(dialog_delegate->GetNativeDialog());
   EXPECT_TRUE(IsShowingWebContentsModalDialog(web_contents));
 }
 
 // Tests that ReleaseWebContentsOnDialogClose() works.
 IN_PROC_BROWSER_TEST_F(ConstrainedWebDialogBrowserTest,
                        ReleaseWebContentsOnDialogClose) {
   // The delegate deletes itself.
-  WebDialogDelegate* delegate = new ui::test::TestWebDialogDelegate(
+  WebDialogDelegate* delegate = new ChildModalTestWebDialogDelegate(
       GURL(chrome::kChromeUIConstrainedHTMLTestURL));
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   ASSERT_TRUE(web_contents);
 
   ConstrainedWebDialogDelegate* dialog_delegate =
       ShowConstrainedWebDialog(browser()->profile(), delegate, web_contents);
   ASSERT_TRUE(dialog_delegate);
   std::unique_ptr<WebContents> new_tab(dialog_delegate->GetWebContents());
   ASSERT_TRUE(new_tab.get());
@@ skipping 92 matching lines @@
       &IsEqualSizes,
       max_size,
       dialog_delegate)));
 }
 
 // Tests that dialog does not autoresize when autoresizing is not enabled.
 IN_PROC_BROWSER_TEST_F(ConstrainedWebDialogBrowserTest,
                        ContentResizeInNonAutoResizingDialog) {
   // The delegate deletes itself.
   WebDialogDelegate* delegate =
-      new ui::test::TestWebDialogDelegate(GURL(kTestDataURL));
+      new ChildModalTestWebDialogDelegate(GURL(kTestDataURL));
   WebContents* web_contents =
       browser()->tab_strip_model()->GetActiveWebContents();
   ASSERT_TRUE(web_contents);
 
   ConstrainedWebDialogDelegate* dialog_delegate =
       ShowConstrainedWebDialog(browser()->profile(), delegate, web_contents);
   ASSERT_TRUE(dialog_delegate);
   EXPECT_TRUE(dialog_delegate->GetNativeDialog());
   EXPECT_TRUE(IsShowingWebContentsModalDialog(web_contents));
 
@@ skipping 15 matching lines @@
       dialog_delegate)));
 
   // Resize <body> to dimension larger than dialog.
   EXPECT_TRUE(ExecuteScript(dialog_delegate->GetWebContents(),
       GetChangeDimensionsScript(500)));
   ASSERT_TRUE(RunLoopUntil(base::Bind(
       &IsEqualSizes,
       initial_dialog_size,
       dialog_delegate)));
 }