Fall back to local page if online NTP fails to load.

chrome/browser/ui/search/instant_controller.h

Index: chrome/browser/ui/search/instant_controller.h
diff --git a/chrome/browser/ui/search/instant_controller.h b/chrome/browser/ui/search/instant_controller.h
index 6822b28616b728a231bfea09a20627f74cec72c9..086419895fb3cf4ecce7bfffbab601b97f294725 100644
--- a/chrome/browser/ui/search/instant_controller.h
+++ b/chrome/browser/ui/search/instant_controller.h
@@ -266,6 +266,7 @@ class InstantController : public InstantPage::Delegate,
       const GURL& url,
       content::PageTransition transition,
       WindowOpenDisposition disposition) OVERRIDE;
+  virtual void InstantPageLoadFailed(content::WebContents* contents) OVERRIDE;
 
   // Invoked by the InstantLoader when the Instant page wants to delete a
   // Most Visited item.
@@ -281,6 +282,10 @@ class InstantController : public InstantPage::Delegate,
   // Most Visited deletions.
   virtual void UndoAllMostVisitedDeletions() OVERRIDE;
 
+  // Helper function to navigate the given contents to the local fallback
+  // Instant URL and trim the history correctly.
+  void RedirectToLocalNTP(content::WebContents* contents);
+
   // Helper for OmniboxFocusChanged. Commit or discard the overlay.
   void OmniboxLostFocus(gfx::NativeView view_gaining_focus);