Reuse the code within UpdateCheckMark()

ash/common/system/tray/tray_popup_utils.h

Index: ash/common/system/tray/tray_popup_utils.h
diff --git a/ash/common/system/tray/tray_popup_utils.h b/ash/common/system/tray/tray_popup_utils.h
index ecec2227b9618b85c8cbc0315ec7c4be3eb0b3ce..85b3dbbe4d9679410cf858d417667c1a5fd450cf 100644
--- a/ash/common/system/tray/tray_popup_utils.h
+++ b/ash/common/system/tray/tray_popup_utils.h
@@ -32,6 +32,7 @@ class ToggleButton;
 }  // namespace views
 
 namespace ash {
+class HoverHighlightView;
 
 // Factory/utility functions used by the system menu.
 class TrayPopupUtils {
@@ -203,6 +204,15 @@ class TrayPopupUtils {
   // account flow.
   static bool CanOpenWebUISettings(LoginStatus status);
 
+  // Initialize a row in the system menu as checkable and update the check mark
+  // status of this row.
+  static void InitializeAsCheckableRow(HoverHighlightView* container,
+                                       bool checked);
+
+  // Update the status of check mark when click a row in the system menu.

[tdanderson, 2017/04/07 20:57:32]

nit: How about something like "Updates the visibility and a11y state of the
checkable row |container|." here?

+  static void UpdateCheckMarkVisibility(HoverHighlightView* container,
+                                        bool visible);
+
  private:
   // Returns the effective ink drop insets for |host| according to the
   // |ink_drop_style|.