Don't activate a window if screen is locked.

ui/aura/root_window.cc

 // Copyright (c) 2011 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/aura/root_window.h"
 
 #include <string>
 #include <vector>
 
 #include "base/bind.h"
@@ skipping 433 matching lines @@
     MessageLoop::current()->PostTask(
         FROM_HERE,
         base::Bind(&RootWindow::Draw, schedule_paint_factory_.GetWeakPtr()));
   }
 }
 
 bool RootWindow::CanFocus() const {
   return IsVisible();
 }
 
+bool RootWindow::CanReceiveEvents() const {
+  return IsVisible();
+}
+
 internal::FocusManager* RootWindow::GetFocusManager() {
   return this;
 }
 
 RootWindow* RootWindow::GetRootWindow() {
   return this;
 }
 
 void RootWindow::WindowDetachedFromRootWindow(Window* detached) {
   DCHECK(capture_window_ != this);
@@ skipping 84 matching lines @@
       base::StringToInt(parts[1], &parsed_height) && parsed_height > 0) {
     bounds.set_size(gfx::Size(parsed_width, parsed_height));
   } else if (use_fullscreen_host_window_) {
     bounds = gfx::Rect(RootWindowHost::GetNativeScreenSize());
   }
 
   return bounds;
 }
 
 }  // namespace aura