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 7f94f3b172430cb797b2ab6e17efd8f4534801a0..e95176d9d14db771d1814596a280d02cb63abbca 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 && shell->delegate())
+      if (key_code == ui::VKEY_MEDIA_LAUNCH_APP1 && shell->delegate())
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_PREVWINDOW_F5);
       HandleCycleWindowLinear(CYCLE_BACKWARD);
       return true;
     case CYCLE_FORWARD_LINEAR:
-      if (key_code == ui::VKEY_F5 && shell->delegate())
+      if (key_code == ui::VKEY_MEDIA_LAUNCH_APP1 && shell->delegate())
         shell->delegate()->RecordUserMetricsAction(UMA_ACCEL_NEXTWINDOW_F5);
       HandleCycleWindowLinear(CYCLE_FORWARD);
       return true;
@@ -748,7 +748,7 @@ bool AcceleratorController::PerformAction(int action,
       break;
     }
     case TOGGLE_MAXIMIZED: {
-      if (key_code == ui::VKEY_F4 && shell->delegate()) {
+      if (key_code == ui::VKEY_MEDIA_LAUNCH_APP2 && shell->delegate()) {
         shell->delegate()->RecordUserMetricsAction(
             UMA_ACCEL_MAXIMIZE_RESTORE_F4);
       }