Whitelist virtual keyboard container to process events at login screen

ash/keyboard_controller_proxy_stub.h

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef ASH_KEYBOARD_CONTROLLER_PROXY_STUB_H_
+#define ASH_KEYBOARD_CONTROLLER_PROXY_STUB_H_
+
+#include "ash/ash_export.h"
+#include "ui/keyboard/keyboard_controller_proxy.h"
+
+namespace ash {
+
+// Stub implementation of KeyboardControllerProxy
+class ASH_EXPORT KeyboardControllerProxyStub
+    : public keyboard::KeyboardControllerProxy {
+ public:
+  KeyboardControllerProxyStub();
+  virtual ~KeyboardControllerProxyStub();
+
+ private:
+  // Overridden from keyboard::KeyboardControllerProxy:
+  virtual content::BrowserContext* GetBrowserContext() OVERRIDE;
+  virtual ui::InputMethod* GetInputMethod() OVERRIDE;
+  virtual void RequestAudioInput(content::WebContents* web_contents,
+      const content::MediaStreamRequest& request,
+      const content::MediaResponseCallback& callback) OVERRIDE;
+
+  DISALLOW_COPY_AND_ASSIGN(KeyboardControllerProxyStub);
+};
+
+}  // namespace ash
+
+#endif  // ASH_KEYBOARD_CONTROLLER_PROXY_STUB_H_