Print preview not showing if default print is invalid.

chrome/browser/printing/print_preview_message_handler.cc

Index: chrome/browser/printing/print_preview_message_handler.cc
diff --git a/chrome/browser/printing/print_preview_message_handler.cc b/chrome/browser/printing/print_preview_message_handler.cc
index a9462e9afc2aad8b90be41785540844cd2870ca5..89385ac609587d9b711312f404430350012b1703 100644
--- a/chrome/browser/printing/print_preview_message_handler.cc
+++ b/chrome/browser/printing/print_preview_message_handler.cc
@@ -211,6 +211,19 @@ void PrintPreviewMessageHandler::OnPrintPreviewCancelled(int document_cookie) {
   StopWorker(document_cookie);
 }
 
+void PrintPreviewMessageHandler::OnInvalidPrinterSettings(int document_cookie) {
+  // Always need to stop the worker.
+  StopWorker(document_cookie);
+
+  TabContents* print_preview_tab = GetPrintPreviewTab();
+  if (!print_preview_tab)
+    return;
+
+  PrintPreviewUI* print_preview_ui =
+      static_cast<PrintPreviewUI*>(print_preview_tab->web_ui());

[kmadhusu, 2011/08/26 18:50:40]

If the preview tab is hidden for printing, we want to show an alert dialog with
an error message.

Refer to lines #187-190. 

[arthurhsu, 2011/08/29 22:53:16]

Done.

+  print_preview_ui->OnInvalidPrinterSettings();
+}
+
 bool PrintPreviewMessageHandler::OnMessageReceived(
     const IPC::Message& message) {
   bool handled = true;
@@ -229,6 +242,8 @@ bool PrintPreviewMessageHandler::OnMessageReceived(
                         OnDidGetDefaultPageLayout)
     IPC_MESSAGE_HANDLER(PrintHostMsg_PrintPreviewCancelled,
                         OnPrintPreviewCancelled)
+    IPC_MESSAGE_HANDLER(PrintHostMsg_PrintPreviewInvalidPrinterSettings,
+                        OnInvalidPrinterSettings)
     IPC_MESSAGE_UNHANDLED(handled = false)
   IPC_END_MESSAGE_MAP()
   return handled;