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..b1b8a310541a2b509788fc972cbb6535acade6c6 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"
@@ -1499,6 +1500,13 @@ void TabDragController::CompleteDrag() {
   DCHECK(started_drag_);
 
   if (attached_tabstrip_) {
+    if (is_dragging_new_browser_) {
+      // 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()->
+        RemapAsNormalWindow();
+    }
+
     if (is_dragging_new_browser_ || did_restore_window_) {
       if (IsDockedOrSnapped(attached_tabstrip_)) {
         was_source_maximized_ = false;
@@ -1750,6 +1758,7 @@ Browser* TabDragController::CreateBrowserForDrag(
                                       profile,
                                       host_desktop_type_);
   create_params.initial_bounds = new_bounds;
+  create_params.is_being_dragged = true;
   Browser* browser = new Browser(create_params);
   is_dragging_new_browser_ = true;
   SetWindowPositionManaged(browser->window()->GetNativeWindow(), false);