Make browser windows override_redirect when dragging tabs.

chrome/browser/ui/views/tabs/tab_drag_controller.cc

Index: chrome/browser/ui/views/tabs/tab_drag_controller.cc
diff --git a/chrome/browser/ui/views/tabs/tab_drag_controller.cc b/chrome/browser/ui/views/tabs/tab_drag_controller.cc
index e604c7c47692ca25ace806a1355c3f0626e444db..5e046f2ecfa50cea8dd56a2731f3db5431e44b43 100644
--- a/chrome/browser/ui/views/tabs/tab_drag_controller.cc
+++ b/chrome/browser/ui/views/tabs/tab_drag_controller.cc
@@ -29,6 +29,7 @@
 #include "content/public/browser/user_metrics.h"
 #include "content/public/browser/web_contents.h"
 #include "extensions/browser/extension_function_dispatcher.h"
+#include "ui/aura/window_tree_host.h"
 #include "ui/events/event_constants.h"
 #include "ui/events/gestures/gesture_recognizer.h"
 #include "ui/gfx/geometry/point_conversions.h"
@@ -1498,6 +1499,10 @@ void TabDragController::RevertDragAt(size_t drag_index) {
 void TabDragController::CompleteDrag() {
   DCHECK(started_drag_);
 
+  // Remap the window without override-redirect, so that the window manager will
+  // pick it up (we use an unmanaged window while dragging).
+  GetAttachedBrowserWidget()->GetNativeView()->GetHost()->RemapWindow();
+
   if (attached_tabstrip_) {
     if (is_dragging_new_browser_ || did_restore_window_) {
       if (IsDockedOrSnapped(attached_tabstrip_)) {
@@ -1750,6 +1755,7 @@ Browser* TabDragController::CreateBrowserForDrag(
                                       profile,
                                       host_desktop_type_);
   create_params.initial_bounds = new_bounds;
+  create_params.override_redirect = true;
   Browser* browser = new Browser(create_params);
   is_dragging_new_browser_ = true;
   SetWindowPositionManaged(browser->window()->GetNativeWindow(), false);