[M107] wayland: bypass xdg-activation calls during dnd sessions

Gnome Shell xdg-activation implementation seems still buggy/unstable and
crashes were observed in Chrome's tab dragging. More specifically when
dragging a tab out and dropping it outside of any toplevel surface (eg:
on the desktop area), which is addressed in https://crrev.com/c/3913256
Besides that, more crashes were observed when, for example, on
repeatedly drags a tab in and out of its source window. Such crashes
usually bring the whole desktop session down. In order to overcome these
issues, this patches WaylandWindow::Activate to no-op while in
drag-and-drop sessions.

R=​mihlenfeldt@igalia.com

(cherry picked from commit c2f09f9)

Bug: 1366504
Test: Tested manually by repeatedly dragging Chrome tabs in and out.
Change-Id: I66fa0570c86ad666ee6ea35bd4146115bc45511c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3914262
Commit-Queue: Alexander Dunaev <adunaev@igalia.com>
Commit-Queue: Nick Yamane <nickdiego@igalia.com>
Auto-Submit: Nick Yamane <nickdiego@igalia.com>
Reviewed-by: Alexander Dunaev <adunaev@igalia.com>
Cr-Original-Commit-Position: refs/heads/main@{#1050544}
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3917151
Commit-Queue: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Bot-Commit: Rubber Stamper <rubber-stamper@appspot.gserviceaccount.com>
Cr-Commit-Position: refs/branch-heads/5304@{chromium#145}
Cr-Branched-From: 5d7b1fc-refs/heads/main@{#1047731}

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

@@ -247,7 +247,11 @@ void WaylandToplevelWindow::Activate() {
                            ZAURA_SURFACE_ACTIVATE_SINCE_VERSION) {
     zaura_surface_activate(aura_surface_.get());
   } else if (connection()->xdg_activation()) {
-    connection()->xdg_activation()->Activate(root_surface()->surface());
+    // xdg-activation implementation in some compositors is still buggy and
+    // Mutter crashes were observed when windows are activated during window
+    // dragging sessions. See https://crbug.com/1366504.
+    if (!connection()->IsDragInProgress())
+      connection()->xdg_activation()->Activate(root_surface()->surface());
   } else if (gtk_surface1_) {
     gtk_surface1_->RequestFocus();
   }