X11: Add TestDesktopScreenX11 to simulate mouse movement in ui tests

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

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/browser/ui/views/tabs/tab_drag_controller_interactive_uitest.h"
 
 #include <stddef.h>
 
 #include <algorithm>
 
@@ skipping 655 matching lines @@
   // Drag to target_tab_strip. This should stop the nested loop from dragging
   // the window.
   gfx::Point target_point(target_tab_strip->width() -1,
                           target_tab_strip->height() / 2);
   views::View::ConvertPointToScreen(target_tab_strip, &target_point);
   ASSERT_TRUE(test->DragInputToAsync(target_point));
 }
 
 }  // namespace
 
-#if defined(OS_LINUX) && !defined(OS_CHROMEOS)
-// TODO: Disabled as mouse isn't updated propertly, http://crbug.com/640741.
-#define MAYBE_DragToSeparateWindow DISABLED_DragToSeparateWindow
-#else
-#define MAYBE_DragToSeparateWindow DragToSeparateWindow
-#endif
 // Creates two browsers, drags from first into second.
 IN_PROC_BROWSER_TEST_P(DetachToBrowserTabDragControllerTest,
-                       MAYBE_DragToSeparateWindow) {
+                       DragToSeparateWindow) {
   TabStrip* tab_strip = GetTabStripForBrowser(browser());
 
   // Add another tab to browser().
   AddTabAndResetBrowser(browser());
 
   // Create another browser.
   Browser* browser2 = CreateAnotherWindowBrowserAndRelayout();
   TabStrip* tab_strip2 = GetTabStripForBrowser(browser2);
 
   // Move to the first tab and drag it enough so that it detaches, but not
@@ skipping 1810 matching lines @@
                         DetachToBrowserTabDragControllerTest,
                         ::testing::Values("mouse", "touch"));
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTestTouch,
                         ::testing::Values("touch"));
 #else
 INSTANTIATE_TEST_CASE_P(TabDragging,
                         DetachToBrowserTabDragControllerTest,
                         ::testing::Values("mouse"));
 #endif