Only allow to lock the mouse when the tab is in fullscreen mode.

content/browser/renderer_host/render_view_host.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_view_host.h"
 
 #include <string>
 #include <utility>
 #include <vector>
 
@@ skipping 1113 matching lines @@
 
 void RenderViewHost::NotifyRendererUnresponsive() {
   delegate_->RendererUnresponsive(
       this, is_waiting_for_beforeunload_ack_ || is_waiting_for_unload_ack_);
 }
 
 void RenderViewHost::NotifyRendererResponsive() {
   delegate_->RendererResponsive(this);
 }
 
+bool RenderViewHost::CanLockMouse() const {
+  // Only allow to lock the mouse when the current tab is in fullscreen mode.
+  return delegate_->IsFullscreenForCurrentTab();
+}
+
 void RenderViewHost::OnMsgFocus() {
   delegate_->Activate();
 }
 
 void RenderViewHost::OnMsgBlur() {
   delegate_->Deactivate();
 }
 
 void RenderViewHost::ForwardMouseEvent(
     const WebKit::WebMouseEvent& mouse_event) {
@@ skipping 72 matching lines @@
     VLOG(1) << "Blocked URL " << url->spec();
     *url = GURL();
   }
 }
 
 void RenderViewHost::SetAltErrorPageURL(const GURL& url) {
   Send(new ViewMsg_SetAltErrorPageURL(routing_id(), url));
 }
 
 void RenderViewHost::ExitFullscreen() {
+  UnlockMouseIfNecessary();
+
   Send(new ViewMsg_ExitFullscreen(routing_id()));
 }
 
 void RenderViewHost::UpdateWebkitPreferences(const WebPreferences& prefs) {
   Send(new ViewMsg_UpdateWebPreferences(routing_id(), prefs));
 }
 
 void RenderViewHost::ClearFocusedNode() {
   Send(new ViewMsg_ClearFocusedNode(routing_id()));
 }
@@ skipping 166 matching lines @@
 void RenderViewHost::OnRunFileChooser(
     const ViewHostMsg_RunFileChooser_Params& params) {
   delegate_->RunFileChooser(this, params);
 }
 
 void RenderViewHost::OnWebUISend(const GURL& source_url,
                                  const std::string& name,
                                  const base::ListValue& args) {
   delegate_->WebUISend(this, source_url, name, args);
 }