Implement {Start,Stop}CapturingKeyStrokes for Instant.

chrome/browser/ui/search/search_tab_helper.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_SEARCH_SEARCH_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_
 
 #include "base/basictypes.h"
 #include "chrome/browser/ui/search/search_model.h"
 #include "content/public/browser/notification_observer.h"
@@ skipping 25 matching lines @@
   // Invoked when the OmniboxEditModel changes state in some way that might
   // affect the search mode.
   void OmniboxEditModelChanged(bool user_input_in_progress, bool cancelling);
 
   // Invoked when the active navigation entry is updated in some way that might
   // affect the search mode. This is used by Instant when it "fixes up" the
   // virtual URL of the active entry. Regular navigations are captured through
   // the notification system and shouldn't call this method.
   void NavigationEntryUpdated();
 
+  // Invoked when the searchbox on the Instant overlay receives focus.
+  void OnWebSearchBoxFocus();
+
+  // Invoked when the searchbox on the Instant overlay loses focus.
+  void OnWebSearchBoxBlur();
+
   // Overridden from contents::WebContentsObserver:
   virtual void NavigateToPendingEntry(
       const GURL& url,
       content::NavigationController::ReloadType reload_type) OVERRIDE;
 
   // Overridden from content::NotificationObserver:
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
@@ skipping 17 matching lines @@
 
   content::NotificationRegistrar registrar_;
 
   DISALLOW_COPY_AND_ASSIGN(SearchTabHelper);
 };
 
 }  // namespace search
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_UI_SEARCH_SEARCH_TAB_HELPER_H_