Fix X11DesktopHandler::ActivateWindow on Unity for known user gestures

ui/views/widget/desktop_aura/desktop_window_tree_host_win.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_window_tree_host_win.h"
 
 #include "base/win/metro.h"
 #include "third_party/skia/include/core/SkPath.h"
 #include "third_party/skia/include/core/SkRegion.h"
 #include "ui/aura/client/aura_constants.h"
@@ skipping 300 matching lines @@
     message_handler_->SetRegion(NULL);
   }
 
   delete native_region;
 }
 
 void DesktopWindowTreeHostWin::Activate() {
   message_handler_->Activate();
 }
 
+void DesktopWindowTreeHostWin::ActivateForUserGesture() {
+  Activate();
+}
+
 void DesktopWindowTreeHostWin::Deactivate() {
   message_handler_->Deactivate();
 }
 
 bool DesktopWindowTreeHostWin::IsActive() const {
   return message_handler_->IsActive();
 }
 
 void DesktopWindowTreeHostWin::Maximize() {
   message_handler_->Maximize();
@@ skipping 661 matching lines @@
 
 // static
 DesktopWindowTreeHost* DesktopWindowTreeHost::Create(
     internal::NativeWidgetDelegate* native_widget_delegate,
     DesktopNativeWidgetAura* desktop_native_widget_aura) {
   return new DesktopWindowTreeHostWin(native_widget_delegate,
                                       desktop_native_widget_aura);
 }
 
 }  // namespace views