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

ash/accelerators/accelerator_controller.cc

Index: ash/accelerators/accelerator_controller.cc
diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 9341a066d581b16eb7ce67e2cf83ffc920723628..9fb2ef9f2a6465256b443987bab7c567eaeb337f 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -467,12 +467,12 @@ bool AcceleratorController::PerformAction(int action,
       return HandleCycleWindowMRU(WindowCycleController::FORWARD,
                                   accelerator.IsAltDown());
     case CYCLE_BACKWARD_LINEAR:
-      if (key_code == ui::VKEY_F5)
+      if (key_code == ui::VKEY_MEDIA_LAUNCH_APP1)
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_PREVWINDOW_F5);
       HandleCycleWindowLinear(CYCLE_BACKWARD);
       return true;
     case CYCLE_FORWARD_LINEAR:
-      if (key_code == ui::VKEY_F5)
+      if (key_code == ui::VKEY_MEDIA_LAUNCH_APP1)
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_NEXTWINDOW_F5);
       HandleCycleWindowLinear(CYCLE_FORWARD);
       return true;
@@ -730,7 +730,7 @@ bool AcceleratorController::PerformAction(int action,
       break;
     }
     case TOGGLE_MAXIMIZED: {
-      if (key_code == ui::VKEY_F4) {
+      if (key_code == ui::VKEY_MEDIA_LAUNCH_APP2) {
         shell->delegate()->RecordUserMetricsAction(
             UMA_ACCEL_MAXIMIZE_RESTORE_F4);
       }