Add reference-counting for mailbox textures.

content/common/gpu/gpu_command_buffer_stub.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_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 #define CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_
 
 #include <deque>
 #include <string>
 #include <vector>
@@ skipping 112 matching lines @@
 
   void AddDestructionObserver(DestructionObserver* observer);
   void RemoveDestructionObserver(DestructionObserver* observer);
 
   // Associates a sync point to this stub. When the stub is destroyed, it will
   // retire all sync points that haven't been previously retired.
   void AddSyncPoint(uint32 sync_point);
 
   void SetPreemptByFlag(scoped_refptr<gpu::PreemptionFlag> flag);
 
+  void OnDestroySurface(int surface_id);
+
  private:
   GpuMemoryManager* GetMemoryManager();
   bool MakeCurrent();
   void Destroy();
 
   // Cleans up and sends reply if OnInitialize failed.
   void OnInitializeFailed(IPC::Message* reply_message);
 
   // Message handlers:
   void OnInitialize(base::SharedMemoryHandle shared_state_shm,
@@ skipping 105 matching lines @@
   size_t active_url_hash_;
 
   size_t total_gpu_memory_;
 
   DISALLOW_COPY_AND_ASSIGN(GpuCommandBufferStub);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_COMMON_GPU_GPU_COMMAND_BUFFER_STUB_H_