Allow deleted resources to be used

gpu/command_buffer/service/vertex_attrib_manager.h

 // 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.
 
 #include <list>
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "build/build_config.h"
 #include "gpu/command_buffer/service/buffer_manager.h"
 #include "gpu/command_buffer/service/gl_utils.h"
@@ skipping 93 matching lines @@
       DCHECK_GT(real_stride, 0);
       buffer_ = buffer;
       size_ = size;
       type_ = type;
       normalized_ = normalized;
       gl_stride_ = gl_stride;
       real_stride_ = real_stride;
       offset_ = offset;
     }
 
+    void Unbind(BufferManager::BufferInfo* buffer) {
+      if (buffer_ == buffer) {
+        buffer_ = NULL;
+      }
+    }
+
     // The index of this attrib.
     GLuint index_;
 
     // Whether or not this attribute is enabled.
     bool enabled_;
 
     // number of components (1, 2, 3, 4)
     GLint size_;
 
     // GL_BYTE, GL_FLOAT, etc. See glVertexAttribPointer.
@@ skipping 64 matching lines @@
         --num_fixed_attribs_;
       }
       if (type == GL_FIXED) {
         ++num_fixed_attribs_;
       }
       info->SetInfo(
           buffer, size, type, normalized, gl_stride, real_stride, offset);
     }
   }
 
+  void Unbind(BufferManager::BufferInfo* buffer);
 
  private:
   uint32 max_vertex_attribs_;
 
   // number of attribs using type GL_FIXED.
   int num_fixed_attribs_;
 
   // Info for each vertex attribute saved so we can check at glDrawXXX time
   // if it is safe to draw.
   scoped_array<VertexAttribInfo> vertex_attrib_infos_;
 
   // Lists for which vertex attribs are enabled, disabled.
   VertexAttribInfoList enabled_vertex_attribs_;
   VertexAttribInfoList disabled_vertex_attribs_;
 };
 
 }  // namespace gles2
 }  // namespace gpu