Allow immutable textures into mailboxes

gpu/command_buffer/service/texture_definition.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 GPU_COMMAND_BUFFER_SERVICE_TEXTURE_DEFINITION_H_
 #define GPU_COMMAND_BUFFER_SERVICE_TEXTURE_DEFINITION_H_
 
 #include <vector>
 
 #include "base/callback.h"
@@ skipping 28 matching lines @@
     GLenum type;
     bool cleared;
   };
 
   typedef std::vector<std::vector<LevelInfo> > LevelInfos;
 
   typedef base::Callback<void(TextureDefinition*)> DestroyCallback;
 
   TextureDefinition(GLenum target,
                     GLuint service_id,
+                    bool immutable,
                     const LevelInfos& level_infos);
   ~TextureDefinition();
 
   GLenum target() const {
     return target_;
   }
 
   GLuint ReleaseServiceId();
 
+  const bool immutable() const { return immutable_; }
+
   const LevelInfos& level_infos() const {
     return level_infos_;
   }
 
  private:
   GLenum target_;
   GLuint service_id_;
+  bool immutable_;
   std::vector<std::vector<LevelInfo> > level_infos_;
 
   DISALLOW_COPY_AND_ASSIGN(TextureDefinition);
 };
 
 }  // namespage gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_TEXTURE_DEFINITION_H_
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