Free the command buffer when tabs are switched

webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.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.
 
 #if defined(ENABLE_GPU)
 
 #include "webkit/gpu/webgraphicscontext3d_in_process_command_buffer_impl.h"
 
 #include <GLES2/gl2.h>
 #ifndef GL_GLEXT_PROTOTYPES
@@ skipping 458 matching lines @@
   }
 
   // TODO(gman): This needs to be true if this is Pepper.
   bool bind_generates_resource = false;
   decoder_.reset(::gpu::gles2::GLES2Decoder::Create(context_group ?
       context_group->decoder_->GetContextGroup() :
           new ::gpu::gles2::ContextGroup(bind_generates_resource)));
 
   gpu_scheduler_.reset(new GpuScheduler(command_buffer_.get(),
                                         decoder_.get(),
-                                        NULL));
+                                        decoder_.get()));
 
   decoder_->set_engine(gpu_scheduler_.get());
 
   if (onscreen) {
     if (render_surface == gfx::kNullPluginWindow) {
       LOG(ERROR) << "Invalid surface handle for onscreen context.";
       command_buffer_.reset();
     } else {
       surface_ = gfx::GLSurface::CreateViewGLSurface(false, render_surface);
     }
@@ skipping 1199 matching lines @@
   context_lost_reason_ = GL_UNKNOWN_CONTEXT_RESET_ARB;
   if (context_lost_callback_) {
     context_lost_callback_->onContextLost();
   }
 }
 
 }  // namespace gpu
 }  // namespace webkit
 
 #endif  // defined(ENABLE_GPU)