InstantExtended: don't reset InstantTab if not ready.

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 e75495bc346e5a400a1976cb939f427209774a34..85d7949ce103bf8e560c1e45ec9278d8b6c87390 100644
--- a/chrome/browser/ui/search/instant_controller.h
+++ b/chrome/browser/ui/search/instant_controller.h
@@ -382,6 +382,10 @@ class InstantController : public InstantPage::Delegate,
   // Returns true if the local page is being used.
   bool UsingLocalPage() const;
 
+  // Returns true iff |use_tab_for_suggestions_| is true and |instant_tab_|
+  // exists.
+  bool UseTabForSuggestions() const;
+
   BrowserInstantController* const browser_;
 
   // Whether the extended API and regular API are enabled. If both are false,
@@ -406,6 +410,11 @@ class InstantController : public InstantPage::Delegate,
   scoped_ptr<InstantNTP> ntp_;
   scoped_ptr<InstantTab> instant_tab_;
 
+  // If true, send suggestion-related events (such as user key strokes, auto
+  // complete results, etc.) to |instant_tab_| instead of |overlay_|. Once set
+  // to false, will stay false until the overlay is hidden or committed.
+  bool use_tab_for_suggestions_;
+
   // The most recent full_text passed to Update(). If empty, we'll not accept
   // search suggestions from |overlay_| or |instant_tab_|.
   string16 last_omnibox_text_;