diff -r 000000000000 -r 6474c204b198 gfx/angle/src/libGLESv2/renderer/BufferStorage.h
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/gfx/angle/src/libGLESv2/renderer/BufferStorage.h	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,44 @@
+//
+// Copyright (c) 2013 The ANGLE Project Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+//
+
+// BufferStorage.h Defines the abstract BufferStorage class.
+
+#ifndef LIBGLESV2_RENDERER_BUFFERSTORAGE_H_
+#define LIBGLESV2_RENDERER_BUFFERSTORAGE_H_
+
+#include "common/angleutils.h"
+
+namespace rx
+{
+
+class BufferStorage
+{
+  public:
+    BufferStorage();
+    virtual ~BufferStorage();
+
+    // The data returned is only guaranteed valid until next non-const method.
+    virtual void *getData() = 0;
+    virtual void setData(const void* data, unsigned int size, unsigned int offset) = 0;
+    virtual void clear() = 0;
+    virtual unsigned int getSize() const = 0;
+    virtual bool supportsDirectBinding() const = 0;
+    virtual void markBufferUsage();
+    unsigned int getSerial() const;
+
+  protected:
+    void updateSerial();
+
+  private:
+    DISALLOW_COPY_AND_ASSIGN(BufferStorage);
+
+    unsigned int mSerial;
+    static unsigned int mNextSerial;
+};
+
+}
+
+#endif // LIBGLESV2_RENDERER_BUFFERSTORAGE_H_