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..5d17c88f638761614228062d2d567f227f648cf2 100644
--- a/chrome/browser/ui/search/instant_controller.h
+++ b/chrome/browser/ui/search/instant_controller.h
@@ -281,6 +281,14 @@ class InstantController : public InstantPage::Delegate,
   // Most Visited deletions.
   virtual void UndoAllMostVisitedDeletions() OVERRIDE;
 
+  // Invoked by the InstantLoader when the Instant page is preloaded as the
+  // NTP and is ready to display.
+  virtual void InstantPageLoadFailed(content::WebContents* contents) OVERRIDE;

[samarth, 2013/04/30 17:10:33]

Put this with the rest of the InstantPage::Delegate overrides (and no need to
repeat the comment).

[David Black, 2013/04/30 23:09:08]

Done.

+
+  // 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);