Defer render_widget draw until host window is available

content/renderer/render_widget.h

 // 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.
 
 #ifndef CONTENT_RENDERER_RENDER_WIDGET_H_
 #define CONTENT_RENDERER_RENDER_WIDGET_H_
 #pragma once
 
 #include <deque>
 #include <vector>
@@ skipping 347 matching lines @@
   //
   // This ID may refer to an invalid view if that view is closed before this
   // view is.
   int32 opener_id_;
 
   // The position where this view should be initially shown.
   gfx::Rect initial_pos_;
 
   // The window we are embedded within.  TODO(darin): kill this.
   gfx::NativeViewId host_window_;
+  bool host_window_set_;
 
   // We store the current cursor object so we can avoid spamming SetCursor
   // messages.
   WebCursor current_cursor_;
 
   // The size of the RenderWidget.
   gfx::Size size_;
 
   // The TransportDIB that is being used to transfer an image to the browser.
   TransportDIB* current_paint_buf_;
@@ skipping 112 matching lines @@
   // delay sending of UpdateRect until the corresponding SwapBuffers has been
   // executed. Since we can have several in flight, we need to keep them in a
   // queue. Note: some SwapBuffers may not correspond to an update, in which
   // case NULL is added to the queue.
   std::deque<ViewHostMsg_UpdateRect*> updates_pending_swap_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderWidget);
 };
 
 #endif  // CONTENT_RENDERER_RENDER_WIDGET_H_