Remove the SWP_SHOWWINDOW flag when resizing the compositor host window on the gpu process. If th...

content/browser/gpu_process_host_ui_shim.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/gpu_process_host_ui_shim.h"
 
 #include "base/command_line.h"
 #include "base/id_map.h"
 #include "base/process_util.h"
 #include "chrome/browser/browser_process.h"
@@ skipping 263 matching lines @@
         gdk_window_resize(window, size.width(), size.height());
         XSync(display, False);
       }
 #elif defined(OS_WIN)
       SetWindowPos(handle,
           NULL,
           0, 0,
           size.width(),
           size.height(),
           SWP_NOSENDCHANGING | SWP_NOCOPYBITS | SWP_NOZORDER |
-              SWP_NOACTIVATE | SWP_DEFERERASE | SWP_SHOWWINDOW);
+              SWP_NOACTIVATE | SWP_DEFERERASE);
 #endif
     }
   }
 
   // Always respond even if the window no longer exists. The GPU process cannot
   // make progress on the resizing command buffer until it receives the
   // response.
   Send(new GpuMsg_ResizeViewACK(renderer_id, command_buffer_route_id));
 }
 
@@ skipping 42 matching lines @@
     int render_view_id) {
   RenderViewHost* host = RenderViewHost::FromID(renderer_id,
                                                 render_view_id);
   if (!host) {
     return;
   }
   host->ScheduleComposite();
 }
 
 #endif