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

chrome/browser/ui/ash/volume_controller_chromeos.cc

 // 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.
 
 #include "chrome/browser/ui/ash/volume_controller_chromeos.h"
 
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/chromeos/audio/audio_handler.h"
 #include "chrome/browser/extensions/system/system_api.h"
 #include "content/public/browser/user_metrics.h"
 
 namespace {
 
 // Percent by which the volume should be changed when a volume key is pressed.
 const double kStepPercentage = 4.0;
 
 }  // namespace
 
 bool VolumeController::HandleVolumeMute(const ui::Accelerator& accelerator) {
-  if (accelerator.key_code() == ui::VKEY_F8)
+  if (accelerator.key_code() == ui::VKEY_VOLUME_MUTE)
     content::RecordAction(content::UserMetricsAction("Accel_VolumeMute_F8"));
 
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();
 
   // Always muting (and not toggling) as per final decision on
   // http://crosbug.com/3751
   audio_handler->SetMuted(true);
 
   extensions::DispatchVolumeChangedEvent(audio_handler->GetVolumePercent(),
                                          audio_handler->IsMuted());
   return true;
 }
 
 bool VolumeController::HandleVolumeDown(const ui::Accelerator& accelerator) {
-  if (accelerator.key_code() == ui::VKEY_F9)
+  if (accelerator.key_code() == ui::VKEY_VOLUME_DOWN)
     content::RecordAction(content::UserMetricsAction("Accel_VolumeDown_F9"));
 
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();
   if (audio_handler->IsMuted())
     audio_handler->SetVolumePercent(0.0);
   else
     audio_handler->AdjustVolumeByPercent(-kStepPercentage);
 
   extensions::DispatchVolumeChangedEvent(audio_handler->GetVolumePercent(),
                                          audio_handler->IsMuted());
   return true;
 }
 
 bool VolumeController::HandleVolumeUp(const ui::Accelerator& accelerator) {
-  if (accelerator.key_code() == ui::VKEY_F10)
+  if (accelerator.key_code() == ui::VKEY_VOLUME_UP)
     content::RecordAction(content::UserMetricsAction("Accel_VolumeUp_F10"));
 
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();
   if (audio_handler->IsMuted()) {
     audio_handler->SetMuted(false);
   } else {
     audio_handler->AdjustVolumeByPercent(kStepPercentage);
   }
 
   extensions::DispatchVolumeChangedEvent(audio_handler->GetVolumePercent(),
@@ skipping 18 matching lines @@
 void VolumeController::SetVolumeLevel(float level) {
   SetVolumePercent(level * 100.f);
 }
 
 void VolumeController::SetVolumePercent(double percent) {
   chromeos::AudioHandler* audio_handler = chromeos::AudioHandler::GetInstance();
   audio_handler->SetVolumePercent(percent);
   extensions::DispatchVolumeChangedEvent(audio_handler->GetVolumePercent(),
                                          audio_handler->IsMuted());
 }