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

ash/accelerators/accelerator_controller.h

Index: ash/accelerators/accelerator_controller.h
diff --git a/ash/accelerators/accelerator_controller.h b/ash/accelerators/accelerator_controller.h
index 5689a419e5f6d20cf54f34a19d5ab3357618c307..d4290639fd0ec1f70f95fc7f8608bc53ba8280cd 100644
--- a/ash/accelerators/accelerator_controller.h
+++ b/ash/accelerators/accelerator_controller.h
@@ -111,6 +111,9 @@ class ASH_EXPORT AcceleratorController : public ui::AcceleratorTarget {
   BrightnessControlDelegate* brightness_control_delegate() const {
     return brightness_control_delegate_.get();
   }
+  ScreenshotDelegate* screenshot_delegate() const {
+    return screenshot_delegate_.get();
+  }
 
   // Provides access to an object holding contextual information.
   AcceleratorControllerContext* context() {