Prevent excessive beeping in case of Find On Page search failure

chrome/browser/ui/find_bar/find_tab_helper.h

 // Copyright (c) 2011 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_FIND_BAR_FIND_TAB_HELPER_H_
 #define CHROME_BROWSER_UI_FIND_BAR_FIND_TAB_HELPER_H_
 
 #include "base/macros.h"
 #include "build/build_config.h"
 #include "chrome/browser/ui/find_bar/find_bar_controller.h"
 #include "chrome/browser/ui/find_bar/find_notification_details.h"
 #include "content/public/browser/web_contents_observer.h"
 #include "content/public/browser/web_contents_user_data.h"
 #include "ui/gfx/range/range.h"
 
 // Per-tab find manager. Handles dealing with the life cycle of find sessions.
 class FindTabHelper : public content::WebContentsObserver,
                       public content::WebContentsUserData<FindTabHelper> {
  public:
   ~FindTabHelper() override;
 
   // Starts the Find operation by calling StartFinding on the Tab. This function
-  // can be called from the outside as a result of hot-keys, so it uses the
-  // last remembered search string as specified with set_find_string(). This
+  // can be called from the outside as a result of hot-keys, so if
+  // |search_string| is null, it finds the last remembered search string. This
   // function does not block while a search is in progress. The controller will
   // receive the results through the notification mechanism. See Observe(...)
   // for details.
   void StartFinding(base::string16 search_string,
                     bool forward_direction,
                     bool case_sensitive);
 
   // Stops the current Find operation.
   void StopFinding(FindBarController::SelectionAction selection_action);
 
@@ skipping 70 matching lines @@
   // 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_;
 
   // This variable keeps track of the ID of the first find request in the
   // current session, which also uniquely identifies the session.
   int current_find_session_id_;
 
+  // True if HandleFindReply has received a |final_update| notification for the
+  // current request.
+  bool final_update_received_for_current_query_;
+
   // 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).
   base::string16 find_text_;
 
   // The string we searched for before |find_text_|.
   base::string16 previous_find_text_;
 
   // The selection within the text.
   gfx::Range selected_range_;
 
   // Whether the last search was case sensitive or not.
   bool last_search_case_sensitive_;
 
   // 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_;
 
   DISALLOW_COPY_AND_ASSIGN(FindTabHelper);
 };
 
 #endif  // CHROME_BROWSER_UI_FIND_BAR_FIND_TAB_HELPER_H_