[ash-md] Updated layout of Brightness and Audio system menu rows to the material design spec.

ash/common/system/tray/actionable_view.h

Index: ash/common/system/tray/actionable_view.h
diff --git a/ash/common/system/tray/actionable_view.h b/ash/common/system/tray/actionable_view.h
index 1dd60b4b41b68d3e63f6cf764c9ad286868baf64..8d653c4379563587ff1e11d911caa5a96e385f49 100644
--- a/ash/common/system/tray/actionable_view.h
+++ b/ash/common/system/tray/actionable_view.h
@@ -80,6 +80,22 @@ class ASH_EXPORT ActionableView : public views::ButtonListener,
   DISALLOW_COPY_AND_ASSIGN(ActionableView);
 };
 
+// An ActionableView that can be used with a ButtonListener instead of having to
+// extend ActionableView and override PerformAction().
+class ASH_EXPORT ButtonListenerActionableView : public ActionableView {
+ public:
+  ButtonListenerActionableView(SystemTrayItem* owner,
+                               views::ButtonListener* listener);
+
+  // ActionableView:
+  bool PerformAction(const ui::Event& event) override;
+
+ private:
+  views::ButtonListener* listener_;
+
+  DISALLOW_COPY_AND_ASSIGN(ButtonListenerActionableView);
+};
+
 }  // namespace ash
 
 #endif  // ASH_COMMON_SYSTEM_TRAY_ACTIONABLE_VIEW_H_