Chrome OS Accessibility: enable cursor compositing when screen magnifier is enabled.

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 9925f39c8e5f0ff451f571998fb0dbd491f53bde..89946c770244423eb47a099cdb24d5c67d656457 100644
--- a/ash/display/mouse_cursor_event_filter.cc
+++ b/ash/display/mouse_cursor_event_filter.cc
@@ -90,8 +90,10 @@ void MouseCursorEventFilter::OnMouseEvent(ui::MouseEvent* event) {
       return;
   }
 
-  Shell::GetInstance()->display_controller()->
-      cursor_window_controller()->UpdateLocation();
+  if (!(event->flags() & ui::EF_IS_SYNTHESIZED)) {
+    Shell::GetInstance()->display_controller()->
+        cursor_window_controller()->UpdateLocation();
+  }
 
   gfx::Point point_in_screen(event->location());
   aura::Window* target = static_cast<aura::Window*>(event->target());