GPUProcessor uses O3D command buffer service to render to a window....

o3d/gpu_plugin/gpu_plugin_object.cc

 // Copyright (c) 2006-2008 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 <stdlib.h>
 
 #include "base/logging.h"
 #include "o3d/gpu_plugin/np_utils/np_utils.h"
 #include "o3d/gpu_plugin/gpu_plugin_object.h"
 #include "o3d/gpu_plugin/gpu_processor.h"
@@ skipping 71 matching lines @@
   NPBrowser::get()->RetainObject(this);
   return this;
 }
 
 NPObjectPointer<NPObject> GPUPluginObject::OpenCommandBuffer() {
   if (command_buffer_.Get())
     return command_buffer_;
 
   command_buffer_ = NPCreateObject<CommandBuffer>(npp_);
   if (command_buffer_->Initialize(kCommandBufferSize)) {
-    processor_ = new GPUProcessor(command_buffer_);
-    command_buffer_->SetPutOffsetChangeCallback(
-        NewCallback(processor_.get(),
-                    &GPUProcessor::ProcessCommands));
-    UpdateProcessorWindow();
-    return command_buffer_;
+    processor_ = new GPUProcessor(npp_, command_buffer_);
+    if (processor_->Initialize(static_cast<HWND>(window_.window))) {
+      command_buffer_->SetPutOffsetChangeCallback(
+          NewCallback(processor_.get(),
+                      &GPUProcessor::ProcessCommands));
+      UpdateProcessorWindow();
+      return command_buffer_;
+    }
   }
 
+  processor_ = NULL;
   command_buffer_ = NPObjectPointer<CommandBuffer>();
   return command_buffer_;
 }
 
 }  // namespace gpu_plugin
 }  // namespace o3d