ResizeSynchronously should resize the visible viewport as well.

content/renderer/render_widget_fullscreen.cc

 // Copyright (c) 2012 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/renderer/render_widget_fullscreen.h"
 
 #include "content/common/view_messages.h"
 #include "third_party/WebKit/public/web/WebWidget.h"
 
 using blink::WebWidget;
 
 namespace content {
 
 void RenderWidgetFullscreen::show(blink::WebNavigationPolicy) {
   DCHECK(!did_show_) << "received extraneous Show call";
   DCHECK_NE(MSG_ROUTING_NONE, routing_id_);
   DCHECK_NE(MSG_ROUTING_NONE, opener_id_);
 
   if (!did_show_) {
     did_show_ = true;
     Send(new ViewHostMsg_ShowFullscreenWidget(opener_id_, routing_id_));
-    SetPendingWindowRect(initial_pos_);
+    SetPendingWindowRect(initial_rect_);
   }
 }
 
 RenderWidgetFullscreen::RenderWidgetFullscreen(
     const blink::WebScreenInfo& screen_info)
     : RenderWidget(blink::WebPopupTypeNone, screen_info, false, false, false) {}
 
 RenderWidgetFullscreen::~RenderWidgetFullscreen() {}
 
 WebWidget* RenderWidgetFullscreen::CreateWebWidget() {
   // TODO(boliu): Handle full screen render widgets here.
   return RenderWidget::CreateWebWidget(this);
 }
 
 bool RenderWidgetFullscreen::Init(int32 opener_id,
                                   CompositorDependencies* compositor_deps) {
   DCHECK(!webwidget_);
 
   return RenderWidget::DoInit(opener_id, compositor_deps, CreateWebWidget(),
                               new ViewHostMsg_CreateFullscreenWidget(
                                   opener_id, &routing_id_, &surface_id_));
 }
 
 }  // namespace content