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

chrome/browser/printing/print_preview_tab_controller.h

Index: chrome/browser/printing/print_preview_tab_controller.h
diff --git a/chrome/browser/printing/print_preview_tab_controller.h b/chrome/browser/printing/print_preview_tab_controller.h
index 6bfc8dcf69408654b69ae1809762ad5a79e21272..d6ea9033cb3f3ff97f4c6ab95590a67f4554b355 100644
--- a/chrome/browser/printing/print_preview_tab_controller.h
+++ b/chrome/browser/printing/print_preview_tab_controller.h
@@ -21,8 +21,13 @@
 #include "content/common/notification_registrar.h"
 
 class Browser;
+class RenderProcessHost;
 class TabContents;
 
+namespace content {
+struct LoadCommittedDetails;
+}
+
 namespace printing {
 
 class PrintPreviewTabController
@@ -52,7 +57,7 @@ class PrintPreviewTabController
   // Returns NULL if no initiator tab exists for |preview_tab|.
   TabContents* GetInitiatorTab(TabContents* preview_tab);
 
-  // Notification observer implementation.
+  // NotificationObserver implementation.
   virtual void Observe(int type,
                        const NotificationSource& source,
                        const NotificationDetails& details);
@@ -66,6 +71,19 @@ class PrintPreviewTabController
  private:
   friend class base::RefCounted<PrintPreviewTabController>;
 
+  // Handler for the RENDERER_PROCESS_CLOSED notification. This is observed when
+  // the initiator renderer crashed.
+  void OnRendererProcessClosed(RenderProcessHost* rph);
+
+  // Handler for the TAB_CONTENTS_DESTROYED notification. This is observed when
+  // either tab is closed.
+  void OnTabContentsDestroyed(TabContents* tab);
+
+  // Handler for the NAV_ENTRY_COMMITTED notification. This is observed when the
+  // renderer is navigated to a different page.
+  void OnNavEntryCommitted(TabContents* tab,
+                           content::LoadCommittedDetails* details);
+
   // 1:1 relationship between initiator tab and print preview tab.
   // Key: Preview tab.
   // Value: Initiator tab.
@@ -78,6 +96,7 @@ class PrintPreviewTabController
   void AddObservers(TabContents* tab);
   void RemoveObservers(TabContents* tab);
 
+  // Mapping between print preview tab and the corresponding initiator tab.
   PrintPreviewTabMap preview_tab_map_;
 
   // A registrar for listening notifications.