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

chrome/browser/renderer_host/render_view_host.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_RENDERER_HOST_RENDER_VIEW_HOST_H_
 #define CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_
 #pragma once
 
 #include <string>
 #include <vector>
@@ skipping 524 matching lines @@
 
   bool is_waiting_for_unload_ack() { return is_waiting_for_unload_ack_; }
 #endif
 
   // Checks that the given renderer can request |url|, if not it sets it to an
   // empty url.
   static void FilterURL(ChildProcessSecurityPolicy* policy,
                         int renderer_id,
                         GURL* url);
 
+  // Gets the selected text in this view, or the empty string.
+  std::string selected_text();
+
  protected:
   // RenderWidgetHost protected overrides.
   virtual bool PreHandleKeyboardEvent(const NativeWebKeyboardEvent& event,
                                       bool* is_keyboard_shortcut);
   virtual void UnhandledKeyboardEvent(const NativeWebKeyboardEvent& event);
   virtual void OnUserGesture();
   virtual void NotifyRendererUnresponsive();
   virtual void NotifyRendererResponsive();
   virtual void OnMsgFocusedNodeChanged(bool is_editable_node);
   virtual void OnMsgFocus();
@@ skipping 229 matching lines @@
 
   // Whether the accessibility tree should be saved, for unit testing.
   bool save_accessibility_tree_for_testing_;
 
   // The most recently received accessibility tree - for unit testing only.
   webkit_glue::WebAccessibility accessibility_tree_;
 
   // The termination status of the last render view that terminated.
   base::TerminationStatus render_view_termination_status_;
 
+  // The most recently selected text.
+  std::string selected_text_;
+
   DISALLOW_COPY_AND_ASSIGN(RenderViewHost);
 };
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_RENDER_VIEW_HOST_H_