Use rewriting to make ChromeOS keyboard F<number> keys produce extended keycodes.

chrome/browser/ui/ash/event_rewriter.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_ASH_EVENT_REWRITER_H_
 #define CHROME_BROWSER_UI_ASH_EVENT_REWRITER_H_
 
 #include <map>
 #include <string>
 
@@ skipping 108 matching lines @@
   //  * Ctrl+Alt+Down -> End
   // When the Search key acts as a function key, it instead maps:
   //  * Search+Backspace -> Delete
   //  * Search+Up -> Prior (aka PageUp)
   //  * Search+Down -> Next (aka PageDown)
   //  * Search+Left -> Home
   //  * Search+right -> End
   // Returns true whn the |event| is rewritten.
   bool RewriteBackspaceAndArrowKeys(ui::KeyEvent* event);
 
+  // When the Search key acts as a function key, it remaps Search+1
+  // through Search+= to F1 through F12. Returns true whn the |event| is
+  // rewritten.
+  bool RewriteFunctionKeys(ui::KeyEvent* event);
+
 #if defined(OS_CHROMEOS)
   // When the Search key acts as a function key, it drops Search key presses,
   // and drops the release as well if any key is pressed while Search was down.
   bool DropSearchKey(ui::KeyEvent* event);
 #endif
 
   // Rewrites the located |event|.
   void RewriteLocatedEvent(ui::LocatedEvent* event);
 
   // Overwrites |event| with the keycodes and flags.
@@ skipping 56 matching lines @@
   unsigned int f3_xkeycode_;
   unsigned int f4_xkeycode_;
   unsigned int f5_xkeycode_;
   unsigned int f6_xkeycode_;
   unsigned int f7_xkeycode_;
   unsigned int f8_xkeycode_;
   unsigned int f9_xkeycode_;
   unsigned int f10_xkeycode_;
   unsigned int f11_xkeycode_;
   unsigned int f12_xkeycode_;
+  unsigned int browser_back_xkeycode_;
+  unsigned int browser_forward_xkeycode_;
+  unsigned int browser_refresh_xkeycode_;
+  unsigned int media_launch_app1_xkeycode_;
+  unsigned int media_launch_app2_xkeycode_;
+  unsigned int brightness_down_xkeycode_;
+  unsigned int brightness_up_xkeycode_;
+  unsigned int volume_mute_xkeycode_;
+  unsigned int volume_down_xkeycode_;
+  unsigned int volume_up_xkeycode_;
+  unsigned int power_xkeycode_;
 
   chromeos::input_method::XKeyboard* xkeyboard_;  // for testing.
 #endif
 
   const PrefService* pref_service_;  // for testing.
 
   DISALLOW_COPY_AND_ASSIGN(EventRewriter);
 };
 
 #endif  // CHROME_BROWSER_UI_ASH_EVENT_REWRITER_H_