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

content/browser/tab_contents/tab_contents.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/tab_contents/tab_contents.h"
 
 #include <cmath>
 
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
@@ skipping 501 matching lines @@
 void TabContents::HandleMouseActivate() {
   if (delegate_)
     delegate_->HandleMouseActivate();
 }
 
 void TabContents::ToggleFullscreenMode(bool enter_fullscreen) {
   if (delegate_)
     delegate_->ToggleFullscreenModeForTab(this, enter_fullscreen);
 }
 
+bool TabContents::IsFullscreenForCurrentTab() const {
+  return delegate_ ? delegate_->IsFullscreenForTab(this) : false;
+}
+
 void TabContents::UpdatePreferredSize(const gfx::Size& pref_size) {
   if (delegate_)
     delegate_->UpdatePreferredSize(this, pref_size);
 }
 
 void TabContents::ShowContents() {
   RenderWidgetHostView* rwhv = GetRenderWidgetHostView();
   if (rwhv)
     rwhv->DidBecomeSelected();
 }
@@ skipping 1487 matching lines @@
 }
 
 void TabContents::SwapInRenderViewHost(RenderViewHost* rvh) {
   render_manager_.SwapInRenderViewHost(rvh);
 }
 
 void TabContents::CreateViewAndSetSizeForRVH(RenderViewHost* rvh) {
   RenderWidgetHostView* rwh_view = view()->CreateViewForWidget(rvh);
   rwh_view->SetSize(view()->GetContainerSize());
 }