If the user selects text in the current tab, and types CTRL-F,...

chrome/browser/ui/find_bar/find_bar_controller.h

 // Copyright (c) 2010 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_BAR_CONTROLLER_H_
 #define CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_CONTROLLER_H_
 #pragma once
 
 #include "base/basictypes.h"
 #include "base/scoped_ptr.h"
+#include "base/string16.h"
 #include "chrome/common/notification_observer.h"
 #include "chrome/common/notification_registrar.h"
 
 namespace gfx {
 class Rect;
 }
 
 class FindBar;
 class TabContents;
 
@@ skipping 44 matching lines @@
   // de-flickering in addition to just calling the update function.
   void UpdateFindBarForCurrentResult();
 
   // For Windows and Linux this function sets the prepopulate text for the
   // Find text box. The propopulate value is the last value the user searched
   // for in the current tab, or (if blank) the last value searched for in any
   // tab. Mac has a global value for search, so this function does nothing on
   // Mac.
   void MaybeSetPrepopulateText();
 
+  // For Windows and Linux this function sets the find text to the text that is
+  // selected in the current tab, if there is any such text. Mac has a global
+  // value for search, so this function does nothing on Mac.
+  void MaybeOverrideText();
+
+  // Gets the text that is selected in the current tab, or an empty string.
+  string16 GetSelectedText();
+
   NotificationRegistrar registrar_;
 
   scoped_ptr<FindBar> find_bar_;
 
   // The TabContents we are currently associated with.  Can be NULL.
   TabContents* tab_contents_;
 
   // The last match count we reported to the user. This is used by
   // UpdateFindBarForCurrentResult to avoid flickering.
   int last_reported_matchcount_;
 
   DISALLOW_COPY_AND_ASSIGN(FindBarController);
 };
 
 #endif  // CHROME_BROWSER_UI_FIND_BAR_FIND_BAR_CONTROLLER_H_