Adding a menu item to take a screenshot under "More Tools" submenu in the Wrench menu.

chrome/browser/ui/browser_commands_chromeos.cc

+// Copyright (c) 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 "chrome/browser/ui/browser_commands_chromeos.h"
+
+#include "ash/accelerators/accelerator_controller.h"
+#include "ash/screenshot_delegate.h"
+#include "ash/shell.h"
+#include "content/public/browser/user_metrics.h"
+#include "content/public/common/user_metrics_action.h"
+
+using content::UserMetricsAction;
+
+namespace chrome {
+
+void TakeScreenshot() {
+  content::RecordAction(UserMetricsAction("Menu_Take_Screenshot"));
+  ash::ScreenshotDelegate* screenshot_delegate = ash::Shell::GetInstance()->
+      accelerator_controller()->screenshot_delegate();
+  if (screenshot_delegate &&
+      screenshot_delegate->CanTakeScreenshot()) {
+    screenshot_delegate->HandleTakeScreenshotForAllRootWindows();
+  }
+}
+
+}  // namespace chrome