Print Preview: Handle a crashed initiator tab by showing a message in PP.

chrome/browser/ui/webui/print_preview_handler.cc

 // Copyright (c) 2011 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 "chrome/browser/ui/webui/print_preview_handler.h"
 
 #include <string>
 
 #include "base/base64.h"
 #if !defined(OS_CHROMEOS)
@@ skipping 414 matching lines @@
   web_ui_->RegisterMessageCallback("morePrinters",
       NewCallback(this, &PrintPreviewHandler::HandleShowSystemDialog));
   web_ui_->RegisterMessageCallback("signIn",
       NewCallback(this, &PrintPreviewHandler::HandleManageCloudPrint));
   web_ui_->RegisterMessageCallback("addCloudPrinter",
       NewCallback(this, &PrintPreviewHandler::HandleManageCloudPrint));
   web_ui_->RegisterMessageCallback("manageCloudPrinters",
       NewCallback(this, &PrintPreviewHandler::HandleManageCloudPrint));
   web_ui_->RegisterMessageCallback("manageLocalPrinters",
       NewCallback(this, &PrintPreviewHandler::HandleManagePrinters));
+  web_ui_->RegisterMessageCallback("reloadCrashedInitiatorTab",
+      NewCallback(this, &PrintPreviewHandler::HandleReloadCrashedInitiatorTab));
   web_ui_->RegisterMessageCallback("closePrintPreviewTab",
       NewCallback(this, &PrintPreviewHandler::HandleClosePreviewTab));
   web_ui_->RegisterMessageCallback("hidePreview",
       NewCallback(this, &PrintPreviewHandler::HandleHidePreview));
   web_ui_->RegisterMessageCallback("cancelPendingPrintRequest",
       NewCallback(this, &PrintPreviewHandler::HandleCancelPendingPrintRequest));
   web_ui_->RegisterMessageCallback("saveLastPrinter",
       NewCallback(this, &PrintPreviewHandler::HandleSaveLastPrinter));
 }
 
@@ skipping 199 matching lines @@
   printing::PrintViewManager* manager = wrapper->print_view_manager();
   manager->set_observer(this);
   manager->PrintForSystemDialogNow();
 }
 
 void PrintPreviewHandler::HandleManagePrinters(const ListValue* args) {
   ++manage_printers_dialog_request_count_;
   printing::PrinterManagerDialog::ShowPrinterManagerDialog();
 }
 
+void PrintPreviewHandler::HandleReloadCrashedInitiatorTab(
+    const ListValue* /* args */) {

[Lei Zhang, 2011/08/16 00:59:23]

nit: just leave off /* args */ like we do in the rest of the file.

[kmadhusu, 2011/08/16 01:31:37]

Done.

+  ReportStats();
+  ReportUserActionHistogram(PREVIEW_FAILED);

[Lei Zhang, 2011/08/16 00:59:23]

Can we use a different histogram value so we can differentiate between failures
and crashes?

[kmadhusu, 2011/08/16 01:31:37]

+ INITIATOR_TAB_CRASHED

Once you are fine with the name, I will add it to the histograms list. 

+
+  TabContents* initiator_tab = GetInitiatorTab();
+  if (!initiator_tab)
+    return;
+
+  initiator_tab->OpenURL(
+      initiator_tab->GetURL(), GURL(), CURRENT_TAB, PageTransition::RELOAD);
+  ActivateInitiatorTabAndClosePreviewTab();
+}
+
 void PrintPreviewHandler::HandleClosePreviewTab(const ListValue* args) {
   ReportStats();
   ReportUserActionHistogram(CANCEL);
 
   // Record the number of times the user requests to regenerate preview data
   // before cancelling.
   UMA_HISTOGRAM_COUNTS("PrintPreview.RegeneratePreviewRequest.BeforeCancel",
                        regenerate_preview_request_count_);
 
   ActivateInitiatorTabAndClosePreviewTab();
@@ skipping 159 matching lines @@
       string16(),
       last_saved_path_->Append(default_filename),
       &file_type_info,
       0,
       FILE_PATH_LITERAL(""),
       preview_tab(),
       platform_util::GetTopLevel(preview_tab()->GetNativeView()),
       NULL);
 }
 
-void PrintPreviewHandler::OnNavigation() {
+void PrintPreviewHandler::OnTabDestroyed() {
   TabContents* initiator_tab = GetInitiatorTab();
   if (!initiator_tab)
     return;
 
   TabContentsWrapper* wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(initiator_tab);
   wrapper->print_view_manager()->set_observer(NULL);
 
   // Tell the initiator tab to stop rendering the print preview, if any,
   // since the preview tab is gone.
@@ skipping 43 matching lines @@
     return;
 
   // We no longer require the initiator tab details. Remove those details
   // associated with the preview tab to allow the initiator tab to create
   // another preview tab.
   printing::PrintPreviewTabController* tab_controller =
      printing::PrintPreviewTabController::GetInstance();
   if (tab_controller)
     tab_controller->EraseInitiatorTabInfo(preview_tab());
 }