Fixing caps lock problems under ChromeOS where the tray does not properly follow the real caps lock…

ash/system/chromeos/tray_caps_lock.h

Index: ash/system/chromeos/tray_caps_lock.h
diff --git a/ash/system/chromeos/tray_caps_lock.h b/ash/system/chromeos/tray_caps_lock.h
index f24ad6b33fa05b4b73f8eb91f4a33c59d3c88144..49251d235e764ab63204e0d428599ad4621871ff 100644
--- a/ash/system/chromeos/tray_caps_lock.h
+++ b/ash/system/chromeos/tray_caps_lock.h
@@ -6,6 +6,7 @@
 #define ASH_SYSTEM_CHROMEOS_TRAY_CAPS_LOCK_H_
 
 #include "ash/system/tray/tray_image_item.h"
+#include "chromeos/ime/xkeyboard.h"
 #include "ui/events/event_handler.h"
 
 namespace views {
@@ -17,13 +18,15 @@ namespace ash {
 class CapsLockDefaultView;
 
 class TrayCapsLock : public TrayImageItem,
-                     public ui::EventHandler {
+                     public ui::EventHandler,
+                     public chromeos::input_method::XKeyboard::Observer {
  public:
   explicit TrayCapsLock(SystemTray* system_tray);
   virtual ~TrayCapsLock();
 
  private:
-  void OnCapsLockChanged(bool enabled);
+  // Overriden from chromeos::input_method::XKeyboard::Observer:
+  virtual void OnCapsLockChanged(bool enabled) OVERRIDE;
 
   // ui::EventHandler:
   virtual void OnKeyEvent(ui::KeyEvent* key) OVERRIDE;