Centralize logic around Instant modes.

chrome/browser/autocomplete/search_provider.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 //
 // This file contains the Search autocomplete provider.  This provider is
 // responsible for all non-keyword autocomplete entries that start with
 // "Search <engine> for ...", including searching for the current input string,
 // search history, and search suggestions.  An instance of it gets created and
 // managed by the autocomplete controller.
 
@@ skipping 41 matching lines @@
                        public net::URLFetcherDelegate {
  public:
   SearchProvider(AutocompleteProviderListener* listener, Profile* profile);
 
 #if defined(UNIT_TEST)
   static void set_query_suggest_immediately(bool value) {
     query_suggest_immediately_ = value;
   }
 #endif
 
+  // See comments for |instant_suggest_enabled_| below.
+  void set_instant_suggest_enabled(bool value) {
+    instant_suggest_enabled_ = value;
+  }
+
   // Marks the instant query as done. If |input_text| is non-empty this changes
   // the 'search what you typed' results text to |input_text| + |suggest_text|.
   // |input_text| is the text the user input into the edit. |input_text| differs
   // from |input_.text()| if the input contained whitespace.
   //
   // This method also marks the search provider as no longer needing to wait for
   // the instant result.
   void FinalizeInstantQuery(const string16& input_text,
                             const string16& suggest_text);
 
@@ skipping 299 matching lines @@
 
   // Whether suggest_results_ is valid.
   bool have_suggest_results_;
 
   // Has FinalizeInstantQuery been invoked since the last |Start|?
   bool instant_finalized_;
 
   // The |suggest_text| parameter passed to FinalizeInstantQuery.
   string16 default_provider_suggest_text_;
 
+  // True if Instant will autocomplete its suggestion into the omnibox.
+  bool instant_suggest_enabled_;
+
   DISALLOW_COPY_AND_ASSIGN(SearchProvider);
 };
 
 #endif  // CHROME_BROWSER_AUTOCOMPLETE_SEARCH_PROVIDER_H_