Pass in the time of the user's last activity timestamp with the NET_ACTIVE_WINDOW event

ui/views/widget/desktop_aura/x11_desktop_handler.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/x11_desktop_handler.h"
 
 #include <X11/Xatom.h>
 #include <X11/Xlib.h>
 
 #include "base/message_loop/message_loop.h"
@@ skipping 24 matching lines @@
 X11DesktopHandler* X11DesktopHandler::get() {
   if (!g_handler)
     g_handler = new X11DesktopHandler;
 
   return g_handler;
 }
 
 X11DesktopHandler::X11DesktopHandler()
     : xdisplay_(gfx::GetXDisplay()),
       x_root_window_(DefaultRootWindow(xdisplay_)),
+      wm_user_time_ms_(0),
       current_window_(None),
       atom_cache_(xdisplay_, kAtomsToCache),
       wm_supports_active_window_(false) {
   if (ui::PlatformEventSource::GetInstance())
     ui::PlatformEventSource::GetInstance()->AddPlatformEventDispatcher(this);
   aura::Env::GetInstance()->AddObserver(this);
 
   XWindowAttributes attr;
   XGetWindowAttributes(xdisplay_, x_root_window_, &attr);
   XSelectInput(xdisplay_, x_root_window_,
@@ skipping 16 matching lines @@
   if (wm_supports_active_window_) {
     DCHECK_EQ(gfx::GetXDisplay(), xdisplay_);
 
     XEvent xclient;
     memset(&xclient, 0, sizeof(xclient));
     xclient.type = ClientMessage;
     xclient.xclient.window = window;
     xclient.xclient.message_type = atom_cache_.GetAtom("_NET_ACTIVE_WINDOW");
     xclient.xclient.format = 32;
     xclient.xclient.data.l[0] = 1;  // Specified we are an app.
-    xclient.xclient.data.l[1] = CurrentTime;
+    xclient.xclient.data.l[1] = wm_user_time_ms_;
     xclient.xclient.data.l[2] = None;
     xclient.xclient.data.l[3] = 0;
     xclient.xclient.data.l[4] = 0;
 
     XSendEvent(xdisplay_, x_root_window_, False,
                SubstructureRedirectMask | SubstructureNotifyMask,
                &xclient);
   } else {
     XRaiseWindow(xdisplay_, window);
 
@@ skipping 93 matching lines @@
   // Update the current window ID to effectively change the active widget.
   current_window_ = xid;
 
   DesktopWindowTreeHostX11* new_host =
       views::DesktopWindowTreeHostX11::GetHostForXID(xid);
   if (new_host)
     new_host->HandleNativeWidgetActivationChanged(true);
 }
 
 }  // namespace views