Fix Print Preview Alt + Left Arrow breakage

chrome/browser/printing/print_preview_dialog_controller_unittest.cc

Index: chrome/browser/printing/print_preview_dialog_controller_unittest.cc
diff --git a/chrome/browser/printing/print_preview_dialog_controller_unittest.cc b/chrome/browser/printing/print_preview_dialog_controller_unittest.cc
index cae8b66e7db7c701ed2a98ee7f91213431421074..732dee4f5e5980252b0ec0b1578cc1bd6593b0f2 100644
--- a/chrome/browser/printing/print_preview_dialog_controller_unittest.cc
+++ b/chrome/browser/printing/print_preview_dialog_controller_unittest.cc
@@ -12,7 +12,9 @@
 #include "chrome/browser/ui/browser_finder.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/webui/print_preview/print_preview_ui.h"
+#include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/navigation_details.h"
+#include "content/public/browser/navigation_entry.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/common/url_constants.h"
 #include "content/public/test/web_contents_tester.h"
@@ -169,4 +171,88 @@ TEST_F(PrintPreviewDialogControllerUnitTest, ClearInitiatorDetails) {
   EXPECT_NE(new_preview_dialog, preview_dialog);
 }
 
+// Test that print preview dialogs close on navigation to new pages
+// and when navigating to old pages via fwd/back, but that auto navigation
+// (typed + address bar) to an existing page as occurs in gmail does not cause
+// the dialogs to close.
+TEST_F(PrintPreviewDialogControllerUnitTest, CloseDialogOnNavigation) {
+

[Lei Zhang, 2016/08/09 01:20:16]

No blank lines at the beginning and end of functions. (git cl lint should tell
you this)

[rbpotter, 2016/08/09 02:14:14]

Done.

+  // Two similar URLs (same webpage, slight difference at end)

[Lei Zhang, 2016/08/09 01:20:17]

s/slight difference.*/different URL fragments/

[rbpotter, 2016/08/09 02:14:14]

Done.

+  GURL tiger_barb("https://www.google.com/#q=tiger+barb");
+  GURL tiger("https://www.google.com/#q=tiger");
+
+  // Set up by opening a new tab and getting web contents
+  EXPECT_EQ(1u, chrome::GetTotalBrowserCount());
+  EXPECT_EQ(0, browser()->tab_strip_model()->count());
+  chrome::NewTab(browser());
+  EXPECT_EQ(1, browser()->tab_strip_model()->count());
+  WebContents* web_contents =
+      browser()->tab_strip_model()->GetActiveWebContents();
+  ASSERT_TRUE(web_contents);
+  content::NavigationController *controller =

[Lei Zhang, 2016/08/09 01:20:16]

content::NavigationController* controller =  <-- star on the left

but why just just take a reference since that's what GetController() returns?

[Lei Zhang, 2016/08/09 01:20:17]

Name this nav_controller since there's also a dialog controller?

[rbpotter, 2016/08/09 02:14:14]

Done.

[rbpotter, 2016/08/09 02:14:14]

Done.

+      &web_contents->GetController();
+  ASSERT_TRUE(controller);

[Lei Zhang, 2016/08/09 01:20:17]

This cannot ever fail.

[rbpotter, 2016/08/09 02:14:14]

Done.

+
+  // Get Print preview controller and navigate to first page

[Lei Zhang, 2016/08/09 01:20:16]

Do you have to do it in this order? |dialog_controller| isn't used until
slightly later. Can we declare variables closer to where they are used?

[rbpotter, 2016/08/09 02:14:14]

Done.

+  PrintPreviewDialogController* dialog_controller =
+      PrintPreviewDialogController::GetInstance();
+  ASSERT_TRUE(dialog_controller);
+  controller->LoadURL(tiger, content::Referrer(), ui::PageTransitionFromInt(
+      ui::PAGE_TRANSITION_LINK), std::string());
+  CommitPendingLoad(controller);
+
+  // Get the preview dialog
+  PrintViewManager *manager = PrintViewManager::FromWebContents(web_contents);

[Lei Zhang, 2016/08/09 01:20:16]

PrintViewManager* manager...

[rbpotter, 2016/08/09 02:14:14]

Done.

+  manager->PrintPreviewNow(false);
+  WebContents* preview_dialog =

[Lei Zhang, 2016/08/09 01:20:16]

Maybe tiger_preview_dialog (and tiger_barb_preview_dialog, etc below) instead of
_2, _3, etc.

[rbpotter, 2016/08/09 02:14:14]

Done.

+      dialog_controller->GetOrCreatePreviewDialog(web_contents);
+
+  // New print preview dialog is a constrained window, so the number of tabs is
+  // still 1.
+  EXPECT_EQ(1, browser()->tab_strip_model()->count());
+  EXPECT_NE(web_contents, preview_dialog);
+
+  // Navigate via link to a similar page.
+  controller->LoadURL(tiger_barb, content::Referrer(),
+                      ui::PageTransitionFromInt(ui::PAGE_TRANSITION_LINK),
+                      std::string());
+  CommitPendingLoad(controller);
+
+  // Print preview now should return true as dialog should be closed.

[Lei Zhang, 2016/08/09 01:20:17]

"Print preview should now return true because the navigation should have closed
|tiger_preview_dialog|."

[rbpotter, 2016/08/09 02:14:14]

Done.

+  ASSERT_TRUE(manager->PrintPreviewNow(false));

[Lei Zhang, 2016/08/09 01:20:16]

Do the ASSERT.*()s here and below need to be ASSERT_, or can they be EXPECT_ ?

[Lei Zhang, 2016/08/09 01:20:17]

Can you do another PrintPreviewNow() before the "tiger_barb" navigation and
check that fails? The comment on the previous line seems to indicate that should
be the case.

[rbpotter, 2016/08/09 02:14:14]

Done.

[rbpotter, 2016/08/09 02:14:14]

Done.

+  WebContents* preview_dialog_2 =
+      dialog_controller->GetOrCreatePreviewDialog(web_contents);
+
+  // Check that new dialog was created
+  ASSERT_TRUE(preview_dialog_2);
+  EXPECT_NE(preview_dialog, preview_dialog_2);

[Lei Zhang, 2016/08/09 01:20:17]

Also check |preview_dialog_2| is not |web_contents|

[rbpotter, 2016/08/09 02:14:14]

Done.

+
+  // Navigate with back button or CTRL+LEFT ARROW to a similar page.

[Lei Zhang, 2016/08/09 01:20:16]

Did you mean ALT?

[rbpotter, 2016/08/09 02:14:14]

Done.

+  controller->GoBack();
+  CommitPendingLoad(controller);
+  ASSERT_TRUE(manager->PrintPreviewNow(false));
+  WebContents* preview_dialog_3 =
+      dialog_controller->GetOrCreatePreviewDialog(web_contents);
+  ASSERT_TRUE(preview_dialog_3);
+  EXPECT_NE(preview_dialog_2, preview_dialog_3);
+
+  // Try to simulate Gmail navigation: Navigate to an existing page (via
+  // Forward) but modify the navigation type while pending to look like an
+  // address bar + typed transition (like Gmail auto navigation)
+  content::NavigationController::LoadURLParams params(tiger);
+  controller->GoForward();
+  controller->GetPendingEntry()->SetTransitionType(ui::PageTransitionFromInt(
+      ui::PAGE_TRANSITION_TYPED|ui::PAGE_TRANSITION_FROM_ADDRESS_BAR));
+  CommitPendingLoad(controller);
+
+  // Print preview should not have changed due to this navigation type so print
+  // preview now should return false and the dialogs should be the same.
+  ASSERT_FALSE(manager->PrintPreviewNow(false));
+  WebContents* preview_dialog_4 =
+      dialog_controller->GetOrCreatePreviewDialog(web_contents);
+  ASSERT_TRUE(preview_dialog_4);
+  EXPECT_EQ(preview_dialog_4, preview_dialog_3);
+
+}
+
 }  // namespace printing