Print Preview: Display a throbber when the user requests the system print

chrome/browser/ui/webui/print_preview_handler.cc

Index: chrome/browser/ui/webui/print_preview_handler.cc
diff --git a/chrome/browser/ui/webui/print_preview_handler.cc b/chrome/browser/ui/webui/print_preview_handler.cc
index aff52a54bf386e83837138abda7a394647e98c50..bd281a0f3d199598edc9dd099423dc390b7c59b4 100644
--- a/chrome/browser/ui/webui/print_preview_handler.cc
+++ b/chrome/browser/ui/webui/print_preview_handler.cc
@@ -552,13 +552,10 @@ void PrintPreviewHandler::HandleShowSystemDialog(const ListValue* args) {
   TabContents* initiator_tab = GetInitiatorTab();
   if (!initiator_tab)
     return;
-  initiator_tab->Activate();
 
   TabContentsWrapper* wrapper =
       TabContentsWrapper::GetCurrentWrapperForContents(initiator_tab);
-  wrapper->print_view_manager()->PrintNow();
-
-  ClosePrintPreviewTab();
+  wrapper->print_view_manager()->PrintNow(this);
 }
 
 void PrintPreviewHandler::HandleManagePrinters(const ListValue* args) {
@@ -631,6 +628,15 @@ void PrintPreviewHandler::ClosePrintPreviewTab() {
       &preview_tab()->controller()), TabStripModel::CLOSE_NONE);
 }
 
+void PrintPreviewHandler::OnPrintDialogShown() {
+  TabContents* initiator_tab = GetInitiatorTab();
+  if (!initiator_tab)
+    return;
+
+  initiator_tab->Activate();
+  ClosePrintPreviewTab();
+}
+
 void PrintPreviewHandler::SelectFile(const FilePath& default_filename) {
   SelectFileDialog::FileTypeInfo file_type_info;
   file_type_info.extensions.resize(1);