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

chrome/renderer/print_web_view_helper.cc

Index: chrome/renderer/print_web_view_helper.cc
diff --git a/chrome/renderer/print_web_view_helper.cc b/chrome/renderer/print_web_view_helper.cc
index e15b78db80bdb10a1aff6d50c3ccc92a0e2f9f7e..172faba6deaf1798682c282bc70f7ddf2392ea3b 100644
--- a/chrome/renderer/print_web_view_helper.cc
+++ b/chrome/renderer/print_web_view_helper.cc
@@ -670,6 +670,8 @@ bool PrintWebViewHelper::GetPrintSettingsFromUser(WebKit::WebFrame* frame,
   params.expected_pages_count = expected_pages_count;
   params.use_overlays = use_browser_overlays;
 
+  Send(new PrintHostMsg_DidShowPrintDialog(routing_id()));
+
   print_pages_params_.reset();
   IPC::SyncMessage* msg =
       new PrintHostMsg_ScriptedPrint(routing_id(), params, &print_settings);