Mouse lock implementation, including the renderer side and the Windows version of the browser side.

content/browser/renderer_host/render_widget_host_view.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 "content/browser/renderer_host/render_widget_host_view.h"
 
+#include "base/logging.h"
 #include "third_party/WebKit/Source/WebKit/chromium/public/WebScreenInfo.h"
 
 #if defined(OS_MACOSX)
 #include "third_party/WebKit/Source/WebKit/chromium/public/mac/WebScreenInfoFactory.h"
 #endif
 
 #if defined(TOUCH_UI) || defined(USE_AURA)
 #include <gdk/gdkx.h>
 #include <gtk/gtk.h>
 
@@ skipping 15 matching lines @@
 #if defined(TOUCH_UI) || defined(USE_AURA)
 // static
 void RenderWidgetHostView::GetDefaultScreenInfo(
     WebKit::WebScreenInfo* results) {
   GdkWindow* gdk_window =
       gdk_display_get_default_group(gdk_display_get_default());
   content::GetScreenInfoFromNativeWindow(gdk_window, results);
 }
 #endif
 
-RenderWidgetHostView::~RenderWidgetHostView() {}
+RenderWidgetHostView::~RenderWidgetHostView() {
+  DCHECK(!mouse_locked_);
+}
 
 void RenderWidgetHostView::SetBackground(const SkBitmap& background) {
   background_ = background;
 }