Add a full screen virtual keyboard to virtual keyboard root window

ash/keyboard_controller_proxy_stub.h

Index: ash/keyboard_controller_proxy_stub.h
diff --git a/ash/keyboard_controller_proxy_stub.h b/ash/keyboard_controller_proxy_stub.h
index 25310d716012678fc6c4b05fef83e1b973ec0969..1e32c5648def7a822411cf79607c7027e5eb7189 100644
--- a/ash/keyboard_controller_proxy_stub.h
+++ b/ash/keyboard_controller_proxy_stub.h
@@ -6,8 +6,13 @@
 #define ASH_KEYBOARD_CONTROLLER_PROXY_STUB_H_
 
 #include "ash/ash_export.h"
+#include "ui/aura/test/test_window_delegate.h"
 #include "ui/keyboard/keyboard_controller_proxy.h"
 
+namespace aura {
+class Window;
+}  // namespace aura
+
 namespace ash {
 
 // Stub implementation of KeyboardControllerProxy
@@ -17,6 +22,8 @@ class ASH_EXPORT KeyboardControllerProxyStub
   KeyboardControllerProxyStub();
   virtual ~KeyboardControllerProxyStub();
 
+  aura::Window* GetKeyboardWindow() OVERRIDE;
+
  private:
   // Overridden from keyboard::KeyboardControllerProxy:
   virtual content::BrowserContext* GetBrowserContext() OVERRIDE;
@@ -25,6 +32,7 @@ class ASH_EXPORT KeyboardControllerProxyStub
       const content::MediaStreamRequest& request,
       const content::MediaResponseCallback& callback) OVERRIDE;
 
+  aura::test::TestWindowDelegate delegate_;
   DISALLOW_COPY_AND_ASSIGN(KeyboardControllerProxyStub);
 };