Fix X11DesktopHandler::ActivateWindow on Unity for known user gestures

ui/views/widget/desktop_aura/desktop_window_tree_host_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_window_tree_host_x11.h"
 
 #include <X11/extensions/shape.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/Xatom.h>
 #include <X11/Xregion.h>
@@ skipping 505 matching lines @@
     custom_window_shape_ = true;
     delete native_region;
   }
   ResetWindowRegion();
 }
 
 void DesktopWindowTreeHostX11::Activate() {
   if (!window_mapped_)
     return;
 
-  X11DesktopHandler::get()->ActivateWindow(xwindow_);
+  X11DesktopHandler::get()->ActivateWindow(xwindow_,
+                                           false /* for_user_gesture */);
+}
+
+void DesktopWindowTreeHostX11::ActivateForUserGesture() {
+  if (!window_mapped_)
+    return;
+
+  X11DesktopHandler::get()->ActivateWindow(xwindow_,
+                                           true /* for_user_gesture */);
 }
 
 void DesktopWindowTreeHostX11::Deactivate() {
   if (!IsActive())
     return;
 
   ReleaseCapture();
   X11DesktopHandler::get()->DeactivateWindow(xwindow_);
 }
 
@@ skipping 1460 matching lines @@
   if (linux_ui) {
     ui::NativeTheme* native_theme = linux_ui->GetNativeTheme(window);
     if (native_theme)
       return native_theme;
   }
 
   return ui::NativeTheme::instance();
 }
 
 }  // namespace views