gfx::Screen: Replace GetWindowUnderCursor() with IsWindowUnderCursor().

ui/views/widget/desktop_aura/desktop_screen_x11.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 "ui/views/widget/desktop_aura/desktop_screen_x11.h"
 
 #include <X11/extensions/Xrandr.h>
 #include <X11/Xlib.h>
 
 // It clashes with out RootWindow.
@@ skipping 131 matching lines @@
                 &child,
                 &root_x,
                 &root_y,
                 &win_x,
                 &win_y,
                 &mask);
 
   return PixelToDIPPoint(gfx::Point(root_x, root_y));
 }
 
-gfx::NativeWindow DesktopScreenX11::GetWindowUnderCursor() {
-  return GetWindowAtScreenPoint(GetCursorScreenPoint());
+bool DesktopScreenX11::IsWindowUnderCursor(gfx::NativeWindow window) {
+  return GetWindowAtScreenPoint(GetCursorScreenPoint()) == window;
 }
 
 gfx::NativeWindow DesktopScreenX11::GetWindowAtScreenPoint(
     const gfx::Point& point) {
   X11TopmostWindowFinder finder;
   return finder.FindLocalProcessWindowAt(
       DIPToPixelPoint(point), std::set<aura::Window*>());
 }
 
 int DesktopScreenX11::GetNumDisplays() const {
@@ skipping 225 matching lines @@
       GetPrimaryDisplay().device_scale_factor());
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 
 display::Screen* CreateDesktopScreen() {
   return new DesktopScreenX11;
 }
 
 }  // namespace views