Implement large cursors in Mushrome.

ash/wm/native_cursor_manager_ash_mus.cc

Index: ash/wm/native_cursor_manager_ash_mus.cc
diff --git a/ash/wm/native_cursor_manager_ash_mus.cc b/ash/wm/native_cursor_manager_ash_mus.cc
index a53c6b6dbdd937057e0b36a748e49cca9403671c..425d036155b8e81a954692ec95850cc27f977a80 100644
--- a/ash/wm/native_cursor_manager_ash_mus.cc
+++ b/ash/wm/native_cursor_manager_ash_mus.cc
@@ -175,11 +175,16 @@ void NativeCursorManagerAshMus::SetVisibility(
 }
 
 void NativeCursorManagerAshMus::SetCursorSet(
-    ui::CursorSetType cursor_set,
+    ui::CursorSet cursor_set,
     ::wm::NativeCursorManagerDelegate* delegate) {
-  // We can't just hand this off to ImageCursors like we do in the classic ash
-  // case. We need to collaborate with the mus server to fully implement this.
-  NOTIMPLEMENTED();
+  delegate->CommitCursorSet(cursor_set);
+
+  ShellPort::Get()->SetCursorSet(cursor_set);
+
+  Shell::Get()
+      ->window_tree_host_manager()
+      ->cursor_window_controller()
+      ->SetCursorSet(cursor_set);
 }
 
 void NativeCursorManagerAshMus::SetMouseEventsEnabled(