Add a full screen virtual keyboard to virtual keyboard root window

ash/display/virtual_keyboard_window_controller.h

Index: ash/display/virtual_keyboard_window_controller.h
diff --git a/ash/display/virtual_keyboard_window_controller.h b/ash/display/virtual_keyboard_window_controller.h
index def3c06fc99814944a0f206134a41d397e74a28f..dbfbb20a21b1c22bb9221458cc1b933fa16b5f48 100644
--- a/ash/display/virtual_keyboard_window_controller.h
+++ b/ash/display/virtual_keyboard_window_controller.h
@@ -9,6 +9,10 @@
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 
+namespace keyboard {
+class KeyboardController;
+}
+
 namespace ash {
 
 namespace internal {
@@ -22,6 +26,12 @@ class ASH_EXPORT VirtualKeyboardWindowController {
   VirtualKeyboardWindowController();
   virtual ~VirtualKeyboardWindowController();
 
+  RootWindowController* root_window_controller() {
+    return root_window_controller_.get();
+  }
+
+  void ActivateKeyboard(keyboard::KeyboardController* keyboard_controller);
+
   // Updates the root window's bounds using |display_info|.
   // Creates the new root window if one doesn't exist.
   void UpdateWindow(const DisplayInfo& display_info);