Maximize window vertically/horizontally when the maximize button is middle/right clicked on Linux

ui/views/widget/desktop_aura/x11_window_event_filter.h

Index: ui/views/widget/desktop_aura/x11_window_event_filter.h
diff --git a/ui/views/widget/desktop_aura/x11_window_event_filter.h b/ui/views/widget/desktop_aura/x11_window_event_filter.h
index 5c7e72229bb0133010a0987bc8477a68c0f7aeec..2949d6fb593873d12d63ae9f18a00dacc5437215 100644
--- a/ui/views/widget/desktop_aura/x11_window_event_filter.h
+++ b/ui/views/widget/desktop_aura/x11_window_event_filter.h
@@ -39,6 +39,13 @@ class VIEWS_EXPORT X11WindowEventFilter : public ui::EventHandler {
   virtual void OnMouseEvent(ui::MouseEvent* event) OVERRIDE;
 
  private:
+  // Called when the user clicked the caption area.
+  void OnClickedCaption(ui::MouseEvent* event,
+                        int previous_click_component);
+
+  // Called when the user clicked the maximize button.
+  void OnClickedMaximizeButton(ui::MouseEvent* event);
+
   void ToggleMaximizedState();
 
   // Dispatches a _NET_WM_MOVERESIZE message to the window manager to tell it