Take a screenshot in maximize mode when volume down and power are pressed.

ash/test/test_lock_state_controller_delegate.h

+// Copyright 2014 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_TEST_TEST_LOCK_STATE_CONTROLLER_DELEGATE_H_
+#define ASH_TEST_TEST_LOCK_STATE_CONTROLLER_DELEGATE_H_
+
+#include "ash/wm/lock_state_controller.h"
+
+namespace ash {
+namespace test {
+
+// Fake implementation of PowerButtonControllerDelegate that just logs requests
+// to lock the screen and shut down the device.
+class TestLockStateControllerDelegate : public LockStateControllerDelegate {
+ public:
+  TestLockStateControllerDelegate();
+  virtual ~TestLockStateControllerDelegate();
+
+  int num_lock_requests() const { return num_lock_requests_; }
+  int num_shutdown_requests() const { return num_shutdown_requests_; }
+
+  // LockStateControllerDelegate implementation.
+  virtual void RequestLockScreen() OVERRIDE;
+  virtual void RequestShutdown() OVERRIDE;
+
+ private:
+  int num_lock_requests_;
+  int num_shutdown_requests_;
+
+  DISALLOW_COPY_AND_ASSIGN(TestLockStateControllerDelegate);
+};
+
+}  // namespace test
+}  // namespace ash
+
+#endif  // ASH_TEST_TEST_LOCK_STATE_CONTROLLER_DELEGATE_H_