[lacros] Send request to wayland-server only if WindowState changes

Send wayland request only if WindowState changes otherwise it
1. triggers IPC between server & client for a state management
2. calls the wl_display_flush.

It is observed that during an initial launch of lacros-browser
`maximize` request is sent twice from DesktopWindowTreeHostPlatform
adding IPC overhead.

This change will also handle minimize, fullscreen and restore
operations.

Bug: 1138978
Change-Id: Ia532c14ec0fa51f2a9e1e4093a0ded17e2610415
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2626945Reviewed-by: Maksim Sisov <msisov@igalia.com>
Commit-Queue: Abhijeet Kandalkar <abhijeet@igalia.com>
Cr-Commit-Position: refs/heads/master@{#843435}

ui/ozone/platform/wayland/host/wayland_toplevel_window.cc

@@ -372,9 +372,11 @@ void WaylandToplevelWindow::TriggerStateChanges() {
 }
 
 void WaylandToplevelWindow::SetWindowState(PlatformWindowState state) {
+  if (state_ != state) {
     previous_state_ = state_;
     state_ = state;
     TriggerStateChanges();
+  }
 }
 
 WmMoveResizeHandler* WaylandToplevelWindow::AsWmMoveResizeHandler() {