Release gpu::ContextGroup in gpu::InProcessCommandBuffer on GPU thread

gpu/ipc/in_process_command_buffer.cc

 // Copyright 2013 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 "gpu/ipc/in_process_command_buffer.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <queue>
@@ skipping 447 matching lines @@
     decoder_.reset();
   }
   context_ = nullptr;
   surface_ = nullptr;
   sync_point_client_ = nullptr;
   if (sync_point_order_data_) {
     sync_point_order_data_->Destroy();
     sync_point_order_data_ = nullptr;
   }
   gl_share_group_ = nullptr;
+  context_group_ = nullptr;
 
   base::AutoLock lock(task_queue_lock_);
   std::queue<std::unique_ptr<GpuTask>> empty;
   task_queue_.swap(empty);
 
   return true;
 }
 
 void InProcessCommandBuffer::CheckSequencedThread() {
   DCHECK(!sequence_checker_ || sequence_checker_->CalledOnValidSequence());
@@ skipping 668 matching lines @@
   return wrapped_callback;
 }
 
 InProcessCommandBuffer::GpuTask::GpuTask(const base::Closure& callback,
                                          uint32_t order_number)
     : callback(callback), order_number(order_number) {}
 
 InProcessCommandBuffer::GpuTask::~GpuTask() {}
 
 }  // namespace gpu