Find-in-page should not ding while deleting characters.

chrome/browser/tab_contents/tab_contents.h

 // Copyright (c) 2009 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_TAB_CONTENTS_TAB_CONTENTS_H_
 #define CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_
 
 #include "build/build_config.h"
 
 #include <map>
@@ skipping 512 matching lines @@
   // Used _only_ by testing to get or set the current request ID.
   int current_find_request_id() { return current_find_request_id_; }
   void set_current_find_request_id(int current_find_request_id) {
     current_find_request_id_ = current_find_request_id;
   }
 
   // Accessor for find_text_. Used to determine if this TabContents has any
   // active searches.
   string16 find_text() const { return find_text_; }
 
+  // Accessor for the previous search we issued.
+  string16 previous_find_text() const { return previous_find_text_; }
+
   // Accessor for last_search_prepopulate_text_. Used to access the last search
   // string entered, whatever tab that search was performed in.
   string16 find_prepopulate_text() const {
     return *last_search_prepopulate_text_;
   }
 
   // Accessor for find_result_.
   const FindNotificationDetails& find_result() const {
     return last_search_result_;
   }
@@ skipping 555 matching lines @@
   // True if a Find operation was aborted. This can happen if the Find box is
   // closed or if the search term inside the Find box is erased while a search
   // is in progress. This can also be set if a page has been reloaded, and will
   // on FindNext result in a full Find operation so that the highlighting for
   // inactive matches can be repainted.
   bool find_op_aborted_;
 
   // This variable keeps track of what the most recent request id is.
   int current_find_request_id_;
 
-  // The last string we searched for. This is used to figure out if this is a
-  // Find or a FindNext operation (FindNext should not increase the request id).
+  // The current string we are/just finished searching for. This is used to
+  // figure out if this is a Find or a FindNext operation (FindNext should not
+  // increase the request id).
   string16 find_text_;
 
+  // The string we searched for before |find_text_|.
+  string16 previous_find_text_;
+
   // Whether the last search was case sensitive or not.
   bool last_search_case_sensitive_;
 
   // Keeps track of the last search string that was used to search in any tab.
   string16* last_search_prepopulate_text_;
 
   // The last find result. This object contains details about the number of
   // matches, the find selection rectangle, etc. The UI can access this
   // information to build its presentation.
   FindNotificationDetails last_search_result_;
@@ skipping 61 matching lines @@
 
   // The time that we started to close the tab.
   base::TimeTicks tab_close_start_time_;
 
   // ---------------------------------------------------------------------------
 
   DISALLOW_COPY_AND_ASSIGN(TabContents);
 };
 
 #endif  // CHROME_BROWSER_TAB_CONTENTS_TAB_CONTENTS_H_