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

ash/test/test_lock_state_controller_delegate.cc

+// 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.
+
+#include "ash/test/test_lock_state_controller_delegate.h"
+
+namespace ash {
+namespace test {
+
+TestLockStateControllerDelegate::TestLockStateControllerDelegate()
+    : num_lock_requests_(0),
+      num_shutdown_requests_(0) {
+}
+
+TestLockStateControllerDelegate::~TestLockStateControllerDelegate() {
+}
+
+void TestLockStateControllerDelegate::RequestLockScreen() {
+  ++num_lock_requests_;
+}
+
+void TestLockStateControllerDelegate::RequestShutdown() {
+  ++num_shutdown_requests_;
+}
+
+}  // namespace test
+}  // namespace ash