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

content/browser/renderer_host/render_widget_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_widget_host.h"
 
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
 #include "base/i18n/rtl.h"
@@ skipping 365 matching lines @@
 
 void RenderWidgetHost::GotFocus() {
   Focus();
 }
 
 void RenderWidgetHost::Focus() {
   Send(new ViewMsg_SetFocus(routing_id_, true));
 }
 
 void RenderWidgetHost::Blur() {
-  if (IsMouseLocked())
-    view_->UnlockMouse();
+  UnlockMouseIfNecessary();
 
   Send(new ViewMsg_SetFocus(routing_id_, false));
 }
 
 void RenderWidgetHost::LostCapture() {
   Send(new ViewMsg_MouseCaptureLost(routing_id_));
 }
 
 void RenderWidgetHost::LostMouseLock() {
   Send(new ViewMsg_MouseLockLost(routing_id_));
 }
 
 void RenderWidgetHost::ViewDestroyed() {
-  if (IsMouseLocked())
-    view_->UnlockMouse();
+  UnlockMouseIfNecessary();
 
   // TODO(evanm): tracking this may no longer be necessary;
   // eliminate this function if so.
   SetView(NULL);
 }
 
 void RenderWidgetHost::SetIsLoading(bool is_loading) {
   is_loading_ = is_loading;
   if (!view_)
     return;
@@ skipping 381 matching lines @@
 
 void RenderWidgetHost::ImeConfirmComposition() {
   Send(new ViewMsg_ImeConfirmComposition(routing_id(), string16()));
 }
 
 void RenderWidgetHost::ImeCancelComposition() {
   Send(new ViewMsg_ImeSetComposition(routing_id(), string16(),
             std::vector<WebKit::WebCompositionUnderline>(), 0, 0));
 }
 
+bool RenderWidgetHost::CanLockMouse() const {
+  return false;
+}
+
+void RenderWidgetHost::UnlockMouseIfNecessary() {
+  if (IsMouseLocked())
+    view_->UnlockMouse();
+}
+
 bool RenderWidgetHost::IsMouseLocked() const {
   return view_ ? view_->mouse_locked() : false;
 }
 
 void RenderWidgetHost::Destroy() {
   NotificationService::current()->Notify(
       content::NOTIFICATION_RENDER_WIDGET_HOST_DESTROYED,
       Source<RenderWidgetHost>(this),
       NotificationService::NoDetails());
 
@@ skipping 330 matching lines @@
 #elif defined(OS_WIN)
   if (view_)
     view_->ShowCompositorHostWindow(is_accelerated_compositing_active_);
 #elif defined(TOOLKIT_USES_GTK)
   if (view_)
     view_->AcceleratedCompositingActivated(activated);
 #endif
 }
 
 void RenderWidgetHost::OnMsgLockMouse() {
-  // TODO(yzshen): Only allow to lock the mouse when in fullscreen mode, and
-  // make sure that the mouse is unlocked when leaving fullscreen mode.
-  if (!view_ || !view_->HasFocus() || !view_->LockMouse()) {
+  if (!CanLockMouse() || !view_ || !view_->HasFocus()|| !view_->LockMouse()) {
     Send(new ViewMsg_LockMouse_ACK(routing_id_, false));
   } else {
     Send(new ViewMsg_LockMouse_ACK(routing_id_, true));
   }
 }
 
 void RenderWidgetHost::OnMsgUnlockMouse() {
-  if (IsMouseLocked())
-    view_->UnlockMouse();
+  UnlockMouseIfNecessary();
 }
 
 #if defined(OS_POSIX)
 void RenderWidgetHost::OnMsgGetScreenInfo(gfx::NativeViewId window_id,
                                           WebKit::WebScreenInfo* results) {
   if (view_)
     view_->GetScreenInfo(results);
   else
     RenderWidgetHostView::GetDefaultScreenInfo(results);
 }
@@ skipping 205 matching lines @@
 void RenderWidgetHost::Delete() {
   Send(new ViewMsg_Delete(routing_id()));
   UserMetrics::RecordAction(UserMetricsAction("DeleteSelection"));
 }
 
 void RenderWidgetHost::SelectAll() {
   Send(new ViewMsg_SelectAll(routing_id()));
   UserMetrics::RecordAction(UserMetricsAction("SelectAll"));
 }