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 3030b7a68252c7187c4fb3ea3984b60db1fd88e1..b25d728ffce5362ebaa0ecba1ec60212d0d384fc 100644
--- a/chrome/browser/ui/search/instant_controller.h
+++ b/chrome/browser/ui/search/instant_controller.h
@@ -228,6 +228,7 @@ class InstantController : public InstantPage::Delegate,
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, PreloadedNTPRenderViewGone);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest,
                            PreloadedNTPDoesntSupportInstant);
+  FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, RedirectToLocalOnLoadFailure);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, ProcessIsolation);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, UnrelatedSiteInstance);
   FRIEND_TEST_ALL_PREFIXES(InstantExtendedTest, ValidatesSuggestions);
@@ -279,6 +280,7 @@ 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.
@@ -294,6 +296,10 @@ 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);
 
@@ -338,6 +344,9 @@ class InstantController : public InstantPage::Delegate,
   // point to it. Else, deletes any existing |instant_tab_|.
   void ResetInstantTab();
 
+  // Sends theme info, omnibox bounds, font info, etc. down to the Instant tab.
+  void UpdateInfoForInstantTab();
+
   // Hide the overlay. Also sends an onchange event (with blank query) to the
   // overlay, telling it to clear out results for any old queries.
   void HideOverlay();