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diff --git a/gfx/angle/src/libANGLE/HandleAllocator.h b/gfx/angle/src/libANGLE/HandleAllocator.h
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+//
+// Copyright (c) 2002-2011 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.
+//
+
+// HandleAllocator.h: Defines the gl::HandleAllocator class, which is used to
+// allocate GL handles.
+
+#ifndef LIBANGLE_HANDLEALLOCATOR_H_
+#define LIBANGLE_HANDLEALLOCATOR_H_
+
+#include "common/angleutils.h"
+
+#include "angle_gl.h"
+
+#include <stack>
+
+namespace gl
+{
+
+class HandleAllocator final : angle::NonCopyable
+{
+ public:
+ // Maximum handle = MAX_UINT-1
+ HandleAllocator();
+ // Specify maximum handle value
+ HandleAllocator(GLuint maximumHandleValue);
+
+ ~HandleAllocator();
+
+ void setBaseHandle(GLuint value);
+
+ GLuint allocate();
+ void release(GLuint handle);
+ void reserve(GLuint handle);
+
+ private:
+ GLuint mBaseValue;
+ GLuint mNextValue;
+ typedef std::vector<GLuint> HandleList;
+ HandleList mFreeValues;
+
+ // Represents an inclusive range [begin, end]
+ struct HandleRange
+ {
+ HandleRange(GLuint beginIn, GLuint endIn) : begin(beginIn), end(endIn) {}
+
+ GLuint begin;
+ GLuint end;
+ };
+
+ struct HandleRangeComparator;
+
+ // The freelist consists of never-allocated handles, stored
+ // as ranges, and handles that were previously allocated and
+ // released, stored in a stack.
+ std::vector<HandleRange> mUnallocatedList;
+ std::vector<GLuint> mReleasedList;
+};
+
+} // namespace gl
+
+#endif // LIBANGLE_HANDLEALLOCATOR_H_