Updated the VK Tray button to properly remove visual activated state.

ash/system/virtual_keyboard/virtual_keyboard_tray.h

Index: ash/system/virtual_keyboard/virtual_keyboard_tray.h
diff --git a/ash/system/virtual_keyboard/virtual_keyboard_tray.h b/ash/system/virtual_keyboard/virtual_keyboard_tray.h
index c741a03945935223d5f16e05f76be41935dc8c3a..2ae272dd3ce51bd333542c70b1bc9632b6a918cd 100644
--- a/ash/system/virtual_keyboard/virtual_keyboard_tray.h
+++ b/ash/system/virtual_keyboard/virtual_keyboard_tray.h
@@ -6,6 +6,7 @@
 #define ASH_SYSTEM_VIRTUAL_KEYBOARD_VIRTUAL_KEYBOARD_TRAY_H_
 
 #include "ash/keyboard/keyboard_ui_observer.h"
+#include "ash/shell_observer.h"
 #include "ash/system/tray/tray_background_view.h"
 #include "base/macros.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
@@ -19,7 +20,8 @@ namespace ash {
 // TODO(sky): make this visible on non-chromeos platforms.
 class VirtualKeyboardTray : public TrayBackgroundView,
                             public KeyboardUIObserver,
-                            public keyboard::KeyboardControllerObserver {
+                            public keyboard::KeyboardControllerObserver,
+                            public ShellObserver {
  public:
   explicit VirtualKeyboardTray(Shelf* shelf);
   ~VirtualKeyboardTray() override;
@@ -37,6 +39,9 @@ class VirtualKeyboardTray : public TrayBackgroundView,
   void OnKeyboardBoundsChanging(const gfx::Rect& new_bounds) override;
   void OnKeyboardClosed() override;
 
+  // ShellObserver:
+  void OnKeyboardControllerCreated() override;
+
  private:
   void ObserveKeyboardController();
   void UnobserveKeyboardController();