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

chrome/browser/ui/webui/print_preview_ui.h

Index: chrome/browser/ui/webui/print_preview_ui.h
diff --git a/chrome/browser/ui/webui/print_preview_ui.h b/chrome/browser/ui/webui/print_preview_ui.h
index 192611bc16a2ede8d125b3838ad002fd82ade6d7..f524f376934a03da673f7fe7a260dc33cc8a5655 100644
--- a/chrome/browser/ui/webui/print_preview_ui.h
+++ b/chrome/browser/ui/webui/print_preview_ui.h
@@ -36,6 +36,9 @@ class PrintPreviewUI : public ChromeWebUI {
   // Clear the existing print preview data.
   void ClearAllPreviewData();
 
+  // Setters
+  void SetInitiatorTabURL(const std::string& initiator_url);
+
   // Notify the Web UI that there is a print preview request.
   // There should be a matching call to OnPreviewDataIsAvailable() or
   // OnPrintPreviewFailed().
@@ -76,7 +79,10 @@ class PrintPreviewUI : public ChromeWebUI {
   // the controls that need the initiator tab for generating the preview data.
   // |initiator_tab_url| is passed in order to display a more accurate error
   // message.
-  void OnInitiatorTabClosed(const std::string& initiator_tab_url);
+  void OnInitiatorTabClosed();
+
+  // Notifies the Web UI that the initiator tab has crashed.
+  void OnInitiatorTabCrashed();
 
   // Notify the Web UI renderer that file selection has been cancelled.
   void OnFileSelectionCancelled();
@@ -106,6 +112,10 @@ class PrintPreviewUI : public ChromeWebUI {
   // Document cookie from the initiator renderer.
   int document_cookie_;
 
+  // Store the |initiator_url| in order to display an accurate error message
+  // when the initiator tab is closed/crashed.
+  std::string initiator_url_;
+
   DISALLOW_COPY_AND_ASSIGN(PrintPreviewUI);
 };