Centralize logic around Instant modes.

chrome/browser/instant/instant_controller.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.
 
 #ifndef CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 117 matching lines @@
 
   // Returns whether the preview will be committed when the mouse or touch
   // pointer is released.
   bool commit_on_pointer_release() const;
 
   // Returns the transition type of the last AutocompleteMatch passed to Update.
   content::PageTransition last_transition_type() const {
     return last_transition_type_;
   }
 
+  // Returns true if Instant will offer up autocomplete suggestions.
+  bool IsSuggestEnabled() const {
+    return mode_ == INSTANT || mode_ == SUGGEST;
+  }
+
   // InstantLoaderDelegate:
   virtual void SetSuggestions(
       InstantLoader* loader,
       const std::vector<InstantSuggestion>& suggestions) OVERRIDE;
   virtual void CommitInstantLoader(InstantLoader* loader) OVERRIDE;
   virtual void InstantLoaderPreviewLoaded(InstantLoader* loader) OVERRIDE;
   virtual void InstantSupportDetermined(InstantLoader* loader,
                                         bool supports_instant) OVERRIDE;
   virtual void SwappedTabContents(InstantLoader* loader) OVERRIDE;
   virtual void InstantLoaderContentsFocused(InstantLoader* loader) OVERRIDE;
@@ skipping 88 matching lines @@
   // Search terms extraction (for autocomplete history matches) doesn't work
   // on Instant URLs. So, whenever the user commits an Instant search, we add
   // an equivalent non-Instant search URL to history, so that the search shows
   // up in autocomplete history matches.
   GURL url_for_history_;
 
   DISALLOW_COPY_AND_ASSIGN(InstantController);
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_CONTROLLER_H_