Implement cursor compositing mode on Ash

ash/display/mouse_cursor_event_filter.cc

Index: ash/display/mouse_cursor_event_filter.cc
diff --git a/ash/display/mouse_cursor_event_filter.cc b/ash/display/mouse_cursor_event_filter.cc
index bc1368f681dda458089ac930d8f99a788b536cf6..6b26427216357daa026ef24d10d17a3d5351fe8f 100644
--- a/ash/display/mouse_cursor_event_filter.cc
+++ b/ash/display/mouse_cursor_event_filter.cc
@@ -4,6 +4,7 @@
 
 #include "ash/display/mouse_cursor_event_filter.h"
 
+#include "ash/display/cursor_window_controller.h"
 #include "ash/display/display_controller.h"
 #include "ash/display/display_manager.h"
 #include "ash/display/mirror_window_controller.h"
@@ -89,6 +90,9 @@ void MouseCursorEventFilter::OnMouseEvent(ui::MouseEvent* event) {
       event->type() != ui::ET_MOUSE_DRAGGED) {
       return;
   }
+
+  Shell::GetInstance()->display_controller()->
+      cursor_window_controller()->UpdateCursorLocation();
   Shell::GetInstance()->display_controller()->
       mirror_window_controller()->UpdateCursorLocation();