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

chrome/browser/ui/browser_commands_chromeos.h

Index: chrome/browser/ui/browser_commands_chromeos.h
diff --git a/chrome/browser/ui/browser_commands_chromeos.h b/chrome/browser/ui/browser_commands_chromeos.h
new file mode 100644
index 0000000000000000000000000000000000000000..8a3836beea7fe020b1cdfff72ab7b22e5ad7aa80
--- /dev/null
+++ b/chrome/browser/ui/browser_commands_chromeos.h
@@ -0,0 +1,15 @@
+// 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.
+
+#ifndef CHROME_BROWSER_UI_BROWSER_COMMANDS_CHROMEOS_H_
+#define CHROME_BROWSER_UI_BROWSER_COMMANDS_CHROMEOS_H_
+
+namespace chrome {
+
+// Takes a screenshot of the entire desktop (not just the browser window)
+void TakeScreenshot();
+
+} // namespace chrome
+
+#endif  // CHROME_BROWSER_UI_BROWSER_COMMANDS_CHROMEOS_H_