Initialize buffers before allowing access to them.

gpu/command_buffer/service/indexed_buffer_binding_host.h

 // Copyright (c) 2016 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_INDEXED_BUFFER_BINDING_HOST_H_
 #define GPU_COMMAND_BUFFER_SERVICE_INDEXED_BUFFER_BINDING_HOST_H_
 
 #include <vector>
 
 #include "base/memory/ref_counted.h"
@@ skipping 37 matching lines @@
   // For glBindBufferBase, return the actual buffer size when this function is
   // called, not when glBindBufferBase is called.
   // For glBindBufferRange, return the |size| set by glBindBufferRange minus
   // the range that's beyond the buffer.
   GLsizeiptr GetEffectiveBufferSize(GLuint index) const;
   GLintptr GetBufferStart(GLuint index) const;
 
   // This is used only for UNIFORM_BUFFER bindings in context switching.
   void RestoreBindings(IndexedBufferBindingHost* prev);
 
+  // Check if |buffer| is currently bound to one of the indexed binding point
+  // from 0 to |used_binding_count| - 1.
+  bool UsesBuffer(size_t used_binding_count, const Buffer* buffer) const;
+
  protected:
   friend class base::RefCounted<IndexedBufferBindingHost>;
 
   virtual ~IndexedBufferBindingHost();
 
  private:
   enum IndexedBufferBindingType {
     kBindBufferBase,
     kBindBufferRange,
     kBindBufferNone
@@ skipping 34 matching lines @@
   bool needs_emulation_;
 
   // This is used for optimization purpose in context switching.
   size_t max_non_null_binding_index_plus_one_;
 };
 
 }  // namespace gles2
 }  // namespace gpu
 
 #endif  // GPU_COMMAND_BUFFER_SERVICE_INDEXED_BUFFER_BINDING_HOST_H_