Add shortcuts for keyboard brightness

ash/accelerators/accelerator_controller.h

Index: ash/accelerators/accelerator_controller.h
diff --git a/ash/accelerators/accelerator_controller.h b/ash/accelerators/accelerator_controller.h
index c85d5494957c5fbbbf934638234a69793f5be4a1..4095392411a2d2baae3fd8f79e452a0599b0c3e4 100644
--- a/ash/accelerators/accelerator_controller.h
+++ b/ash/accelerators/accelerator_controller.h
@@ -24,6 +24,7 @@ namespace ash {
 class BrightnessControlDelegate;
 class CapsLockDelegate;
 class ImeControlDelegate;
+class KeyboardBrightnessControlDelegate;
 class ScreenshotDelegate;
 class VolumeControlDelegate;
 
@@ -77,6 +78,9 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
   void SetCapsLockDelegate(scoped_ptr<CapsLockDelegate> caps_lock_delegate);
   void SetImeControlDelegate(
       scoped_ptr<ImeControlDelegate> ime_control_delegate);
+  void SetKeyboardBrightnessControlDelegate(
+      scoped_ptr<KeyboardBrightnessControlDelegate>
+      keyboard_brightness_control_delegate);
   void SetScreenshotDelegate(
       scoped_ptr<ScreenshotDelegate> screenshot_delegate);
   void SetVolumeControlDelegate(
@@ -105,6 +109,8 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
   scoped_ptr<BrightnessControlDelegate> brightness_control_delegate_;
   scoped_ptr<CapsLockDelegate> caps_lock_delegate_;
   scoped_ptr<ImeControlDelegate> ime_control_delegate_;
+  scoped_ptr<KeyboardBrightnessControlDelegate>
+      keyboard_brightness_control_delegate_;
   scoped_ptr<ScreenshotDelegate> screenshot_delegate_;
   scoped_ptr<VolumeControlDelegate> volume_control_delegate_;