views impl: hide top infobar arrow when omnibox popup shows

chrome/browser/ui/omnibox/omnibox_popup_model.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_UI_OMNIBOX_OMNIBOX_POPUP_MODEL_H_
 #define CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_POPUP_MODEL_H_
 
 #include "base/basictypes.h"
+#include "base/observer_list.h"
 #include "chrome/browser/autocomplete/autocomplete_controller.h"
 #include "chrome/browser/autocomplete/autocomplete_result.h"
 #include "chrome/browser/ui/omnibox/omnibox_edit_model.h"
 
+class OmniboxPopupModelObserver;
 class OmniboxPopupView;
 
 namespace gfx {
 class Image;
 }
 
 class OmniboxPopupModel {
  public:
   // See selected_line_state_ for details.
   enum LineState {
@@ skipping 66 matching lines @@
 
   // The match the user has manually chosen, if any.
   const AutocompleteResult::Selection& manually_selected_match() const {
     return manually_selected_match_;
   }
 
   // Invoked from the edit model any time the result set of the controller
   // changes.
   void OnResultChanged();
 
+  // Add and remove observers.
+  void AddObserver(OmniboxPopupModelObserver* observer);
+  void RemoveObserver(OmniboxPopupModelObserver* observer);
+
   // The token value for selected_line_, hover_line_ and functions dealing with
   // a "line number" that indicates "no line".
   static const size_t kNoMatch;
 
  private:
   OmniboxPopupView* view_;
 
   OmniboxEditModel* edit_model_;
 
   // The line that's currently hovered.  If we're not drawing a hover rect,
   // this will be kNoMatch, even if the cursor is over the popup contents.
   size_t hovered_line_;
 
   // The currently selected line.  This is kNoMatch when nothing is selected,
   // which should only be true when the popup is closed.
   size_t selected_line_;
 
   // If the selected line has both a normal match and a keyword match, this
   // determines whether the normal match (if NORMAL) or the keyword match
   // (if KEYWORD) is selected.
   LineState selected_line_state_;
 
   // The match the user has manually chosen, if any.
   AutocompleteResult::Selection manually_selected_match_;
 
+  // Observers.
+  ObserverList<OmniboxPopupModelObserver> observers_;
+
   DISALLOW_COPY_AND_ASSIGN(OmniboxPopupModel);
 };
 
 #endif  // CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_POPUP_MODEL_H_